We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byLina Tindall
Modified about 1 year ago
© Boardworks Ltd of 7 How are rocks weathered?
© Boardworks Ltd of 7 Most slides contain notes to accompany the presentation. This icon indicates that the notes contain particularly detailed instructions or extension activities. To access these notes go to ‘Notes Page View’ (PowerPoint 97) or ‘Normal View’ (PowerPoint 2000/2002). Normal ViewNotes Page View This icon indicates that a Flash file has been embedded into the PowerPoint slide. These files are not editable. Teacher’s notes and Flash files
© Boardworks Ltd of 7 Weathering – freeze-thaw You may have heard of the saying, “hard as rocks”. This is because as water freezes it expands. This creates powerful forces that can enlarge the cracks. freeze–thaw scree As this freeze–thaw process is repeated and cracks spread through the rock. Eventually small pieces of rock (called scree) break off altogether. scree Most rocks are hard, but despite this they can be broken by just a small amount of water getting into cracks in the rock.
© Boardworks Ltd of 7 Freeze-thaw! Colin forgot to chill the wine so he put it in the freezer to quickly make it cold – but then forgot it was there! Next time he went to the freezer he found it totally shattered. Explain what has happened. The water expanded as it froze creating huge forces. These shattered the glass bottle.
© Boardworks Ltd of 7 Weathering – expansion of rock Freeze thaw is the not the only cause of weathering. In places with large daily changes in temperature (e.g. deserts) expansion and contraction of the rock itself occurs. The surface gets the hottest and so expands the most. This may cause it to “peel off.” Additionally, some rocks contain crystals that expand by very different amounts. This too can cause cracks.
© Boardworks Ltd of 7 Weathering – plants and lichens Plant roots can get into tiny cracks and can physically open them up further. In addition, decaying plant roots also produce acid which can chemically eat away at the rock. Similarly lichens produce acids which weather the rocks upon which the lichens are growing. Plant roots can cause cracks in rocks pH876543
© Boardworks Ltd of 7 Weathering – chemicals Firstly, there is carbon dioxide gas which dissolves in rain to form weak carbonic acid. This very slowly eats away at certain rocks. There are also acids in the rain that can chemically eat away at rocks – especially rocks consisting of metal carbonates (such as chalk, limestone and marble). Secondly, there are nitrogen and sulphur oxides which produce much more acidic rain that can rapidly chemically dissolve the rocks.
Weathering Chapter 6, Section 1. Weathering and Its Effects Weathering Surface processes that break down rock. Rock breaks down into sediment. Sediment.
Rocks and Weathering EQ: What is chemical and mechanical weathering?
Changes to the Earth’s Surface Grade 5 Science. Landforms Landforms are the physical features on the Earth’s surface such as, valleys, rivers, mountains,
Breaking it Down Weathering & Erosion Do Now Breaking it Down Key Question: What is weathering, and what are some examples? Initial Thoughts: 5 minutes.
Rates of Weathering What is differential weathering? How does surface area affect the rate of weathering? How does climate affect the rate of weathering?
6. Minerals and Rocks 6.1 Minerals are all around us 6.2 Rocks form in different ways 6.3 Natural processes break down rocks 6.4 Geologic maps show Earths.
Chapter 8 Weathering, Soils and Weathering, Soils and Mass Movement BFRB Pages
The. of and a to in is you that it he for.
© Boardworks Ltd A slide contains teachers notes wherever this icon is displayed - To access these notes go to Notes Page View (PowerPoint 97) or.
Weathering This week we write it down if its in ORANGE. Photo: Grand Canyon, National Park Service.
Weathering and Erosion. Weathering The breakdown do the materials of Earths crust into smaller pieces.
Weathering …continued. RECAP: What are the conditions required for physical weathering? What kind of conditions would you expect to be required for chemical.
Weathering is the break- up of rock due to exposure to the atmosphere.
Sedimentary Rocks Rocks made of bits & pieces of other rocks.
Weathering and Soil Formation Chapter 10. Old and New Mountains The Appalachian Mountains appear very different from the Sierra Mountains. The Appalachians.
Of. and a to the in is you that it at be.
Fire, floods, volcanoes, hurricanes, and other natural disasters can change communities in a short period of time. Even without a disaster, communities.
Mrs. Wright Hugh B. Bain Middle School Cranston, RI SLOW Processes that Shape the Earth PART 1. WEATHERING.
The Water Cycle In this presentation you will: explore the stages of the water cycle ClassAct SRS enabled.
The. of and a to in is you that it he was.
Topic 12 Topic 12 Topic 12: Kinetic Theory Table of Contents Topic 12 Topic 12 Basic Concepts Additional Concepts.
Chapter: Rocks and Minerals Table of Contents Section 3: Metamorphic Rocks and the Rock CycleMetamorphic Rocks and the Rock Cycle Section 1: MineralsEarths.
Weathering. Definition Weathering is the breakdown of materials of the Earths crust into smaller pieces. (sediment) No movement is involved. Surface or.
High Frequency Words List A Group 1. the of and.
Earth Science NHSPE Preparation and Tutoring. 1. Atmospheric Processes and the Water Cycle.
Changes to the Earth’s surface. The changing Earth The surface of the Earth is always changing.
First you need to know some facts about air and water: 1. Water evaporates and is called water vapor which behaves like all other gases. 2. When any gas.
Since ancient times Nature has served Man being the source of his life. For thousands of years people lived in harmony with environment. But with the.
Three States of Matter Beta Science Overview In this powerpoint you will be introduced to three states of matter and you will explore the similarities.
© 2016 SlidePlayer.com Inc. All rights reserved.