Presentation on theme: "Instructor: Dr. Michelle McMahon"— Presentation transcript:
1Instructor: Dr. Michelle McMahon GEOL 1403 Physical Geology 1Instructor: Dr. Michelle McMahon
2This course explores the theory of geologic COURSE DESCRIPTION:This course explores the theory of geologicprocesses, including a study of physical forces that shape the Earth and all its landforms. Special emphasis is given to the origins of minerals and rocks, volcanoes, earthquakes, structures, landforms, plate tectonics, and other geologic processes. Assignments outside the classroom help students explore and discover links between classroom discussions and life experiences.
3COURSE PURPOSEThe primary purpose of this course is for you to gain an understanding and appreciation of past, present, and future geologic processes that shape the face of the Earth and cause geological events that could directly impact you. The course will provide you with opportunities to solve geology-related problems using geological tools, and observation of geologic processes.
4COURSE OUTCOMES In completing this course, you will: be able to classify some rocks and minerals common to the earth’s surfacebe able to recognize various types of landforms common to the earth and how they were formedBe familiar with the geologic time scalebe able to recognize various geologic hazards and be able to make educated land-use decisionsunderstand the origin of some mineral and energy resources, and have an appreciation for the environmental impact caused by their extraction
5REQUIRED MATERIALS Lecture Text Laboratory Book C.C. Plummer, D. McGeary and D. Carlson, 20__. Physical Geology, editions , McGraw-Hill. Laboratory BookN. W. Jones and C Jones, 20__, Laboratory Manual for Physical Geology, edition McGraw-Hill(some copies are available to be used during the lab period) Internet Access - textbook resources, internet assignments and GoogleEarth
6Recommended Materials ruler in inches and centimetershand lenscolored pencilscalculator
7ATTENDANCE EXPECTATIONS Classroom attendance is critical. If you miss a class meeting, you are encouraged to obtain notes taken by others and to contact the instructor for assistance.Lecture notes and PowerPoint presentations are available online.Lecture tests will be given to students only on the dates indicated. Lecture test make-ups are given only in the case of emergency or illness and only when the instructor has been contacted prior to the exam.
8Exams and Grading Chapter Tests: 4 - each worth 10% of final grade Lab Tests: 3 - each worth 10% of final gradeAverage of Internet Assignments: 10 % of final gradeCampus Mapping Project: 10% of final gradeFinal Exam: 10% of final grade (cumulative)
9Internet AssignmentsInternet Assignments will be assigned throughout the term, relating to the topics studied.Internet Assignments will generally be due 1-2 weeks after they are assigned.Late Internet Assignments will be accepted for and additional week after the due date with 80% being the highest attainable grade.The average of the Internet Assignments = 10% of the final grade
10Laboratory ExercisesThe lab exercises are designed to support the material presented in lecture and in the textbook Labs are not exams. You are not expected to know the answers immediately!It is critical for success on the lab exams, and the mapping exercise, that all lab work be completed.Lab work will not be graded but will be corrected and students will be tested over the material.There are three lab exams and extra credit questions on the lecture test will commonly cover lab work.
11Extra Credit Opportunities Extra credit opportunities are offered throughout the term.10 points of extra credit raises your final grade 1 point.Maximum 50 points of extra creditExtra credit opportunities include:- Textbook review questionslink to textbook online resources- Independent field trip to Houston Museum of Natural Science- LSC-North Harris field trip to Jesse Jones ParkHill County field tripBolivar –Galveston field trip
12OUTSIDE READINGYou are encouraged to bring to class and share any pertinent newspaper or periodical article.Links to web-based articles can be posted on the discussion board.
13Expectation for the Students Taking Physical Geology 1 Geol 1403 I expect students to come to both lecture and lab.I expect students to be on time for lecture and lab.I expect students to have read the chapter before the lecture.I expect student s to stay for the entire class period.I expect students to devote time outside of class to studying and preparing for this class and the class exams.I expect students to work hard.I expect students to treat each other with respect.
14Class “Rules” No inappropriate language No cell phones No cell phones“Test anxiety” is not allowed in classNo cheatingShow respect to all other studentsNo food or drinks
15What you can expect from me Class will start on timeI will work hard to make geology interesting and applicable to everyday life.I will be available to help you before and during class as well as onlines and discussion topics will be addresses within hoursExams and internet problem grades will be available one week after the due date
16GEOL 1403 Physical Geology Introduction and Semester Review
17The Earth as a SystemA System: An interactive set of components that behave in an orderly way according to the laws of nature.The Earth System is divided into four (5?) subsystems:Hydrosphere- waterCryosphere – ice and frozen groundGeosphere- rocksAtmosphere- gas, liquid and solidsBiosphere – plants and organisms
18Biogeochemical Cycles Biogeochemical cycle: the “pathways” along which energy is transferred between Earth’s subsystems.Include:Hydrologic CycleRock CycleCarbon CycleOxygen CycleNitrogen CycleEarth system is closedThe law of conservation of matter and the law of energy conservation (first law of thermal dynamics) applyResidence time
19Why Study Geology? Avoid Geologic Hazards Supply Things We Need Protecting the Environment Understanding Our Surrounding
20DefinitionsGeology: the scientific study of the solid part of the earthPhysical Geology: the division of geology concerned with the earth’s materials, changes of the surface and interior of the earth, and forces that cause those changes
21Other Disciplines of Geology HistoricalGeophysicsSedimentologyPetrography/CrystallographyGlacial GeologyGeomorphologyPaleontology
22Geologist use the Scientific Method to understand how the earth works. 1) A question is asked2) Information pertinent to the question or problem is analyzed. Facts (data) are collected. 3) Data is analyzed and an explanation (hypothesis) is proposed that explains the data.4) Predictions are made 5) Predictions are tested6) Hypothesis that passes the tests become theory that are then subjected to further testing and refinement.
23My goal in this course is simple: I will completely change you perspective on life !!!
24We will be looking at: How Rocks are Formed Time The Ground Below Your Feet Is Moving!How Topographic Features are FormedEarth’s Resources
25This course is divided into six units five main topics Introduction (1)Material Of the Earth (2)Geologic Time (3)Earth’s Internal Processes (4)Earth’s External Processes (5)Geologic Resources (6)
27Minerals and RocksWe will learn to identify the most common minerals that make up the rocks found on earth.We will learn how to distinguish between the three groups of rocks Igneous, Sedimentary and MetamorphicPodcast: The Rock Cycle
29The Earth is 4.6 Billion Years Old That is: 4,600,000,000 yrsGeologic processes take hundred, thousands and millions of years to happen and occur on local, regional and global scales
30Times Scales of Geologic Processes Formation of a gem quality diamond million years ( high pressure and temp)Erosion of a coastline associated with a tsunami or hurricane- hours-daysIce Ages: glacial/interglacial cycle every 100,000 yrs/ 20 in the last 2 million-3 million yrsExtinctions: hundreds, thousands, hundreds of thousands?Formation of a volcanic cone- hundreds of years: destruction of a volcanic cone-minutes(Mt St Helens,1980)Erosion of a mountain range – hundreds of thousands of years- million of yearsFormation of the Texas “Coastal Plain”- 65 million years
312005 Tsunami, Indonesia (before and after images)
32Spatial Scale of Geologic Processes Local to Regional Scale- hurricanes, floods, tsunamis, individual earthquakes, small scale volcanic eruptions, river erosion.Global Scale – plate tectonics, mountain building, large scale volcanic eruptions producing global climate change, large meteorites strikes producing global climate change, Ice ages.
33“Evolution” of Earth Big Bang Planets and Sun forming from a nebular cloud 5 billion years agothe Earths surface was molten- no atmosphere –no oceans- no life(Oldest rocks on earth 4.6 billion years ago)Oceans and atmosphere formed from out-gassing of volcanic eruption at the surface (meteorites and life)½ of earth’s atmosphere is within 5.6 km (3.5 miles) from the surface, 90% of the atmosphere within 100 km (62 miles)First life- single celled bacteria: PrecambrianFirst multi-celled organism: Cambrian ( mya)
35Geologic TimeEarly 1800’s: James Hutton- Father of Modern Geology presented the Principle of:UNIFORMITARIANISMor (Actualism)“ The present is the key to the past”
36Geologists are Interested in Both Relative Age and Absolute Age Determining and dividing rock units:Contact: surface that separates two different rock types or rocks of different ages.Formation: bodies of rocks of considerable thickness with recognizable characteristics that make each distinguishable from adjacent rocks.
37For Relative Age Geologist Use the Steno Principles (Nicolas Steno) Original Horizontality: the beds of sediment deposited in water form horizontal or nearly horizontal layersSuperposition: The oldest layers of rock are at the bottom of a sequence and get younger from the bottom of a sequence to the top
38The Grand Canyon How many formations are identifiable in this image? Where is theoldest formation?Where is the youngest formation?What Steno principle did you use to determine this?
42Earth’s Internal Processes Geologists divided the earth’s interior into three compositional layers:CoreMantleCrust
43Mantle Convection and Tectonic Forces The interior of the Earth moves !The core of the earth is hot and heats the mantleWhen hot mantle material pushes upward it “uplifts” the lithosphere.Where the lithosphere is cool and dense it sinks downward into the deeper mantle.Tectonic Forces cause deformation of rocks as well as vertical and horizontal movement of portions of the earth’s crust.Model for Mantle Convections (figure 19.37)
44Plate Tectonics (A Theory) The lithosphere is broken into plates that are in motion. Much of the evidence for this is found through studies of the plate boundaries.the three types of plate boundariesConvergent boundary: Plates converging- they move towards each other or come together. If one plate is oceanic crust (denser) and the continental crust (less dense) the continental plate will override the oceanic plate.convergent plate boundary (figure 9,32)Divergent boundary: when the plates are moving apart- new continental crust is being formed the formation of a divergent plate boundaryTransform boundary: occurs when two plates slide past each other. transform fault plate boundary (map view)
45The Plate Tectonics Theory The geologic evidence for the plate tectonics theory include:Earthquakes patternsTopography of the sea floorThe distribution of mountains and volcanoesbreaking up of pangaea (figure 19.2)
47The West Coast of the United States is a Plate Tectonics Laboratory (California Oregon, Washington) EarthquakesGeologic StructuresMountain BuildingIgneous Activity- VolcanoesTexas –mountains and igneous activity throughout geologic time
49Landforms - Topographic Features We will study weathering, erosional and depositional processed, and how they create our landscape.We will learn about erosion and deposition by:WaterWindIce ( Glaciers)Gravity ( Mass Wasting)
50Important TermsWeathering: The mechanical or chemical breakdown of rock materialErosion: the physical removal of rock material by mobile agents (water, wind, gravity or ice)Deposition: the physical “dumping” of rock materials by mobile agents (water, wind, gravity or ice)Mass Wasting: the transfer of rock or soil downslope under the influence of gravity
51Mass Wasting (Gravity) :Southern California January 2005
52Texas Geology Gulf of Mexico - Passive Continental Margin We live on the - Texas Coastal PlainAustin and San Antonio - Edwards PlateauWest Texas - Permian BasinWest Texas MountainsDavis MountainsGuadalupeUSGS America’s Volcanic Past - Texas