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Sea Floor Spreading The Mid-ocean Ridge
Vocabulary Sonar Sea-floor spreading Deep-ocean trench Subduction Mid-ocean ridge
60 years ago, in the 1950’s, Sonar was invented.
Bats use it!
So do dolphins So do dolphins!
Sonar brought Wegner’s theory back to life!
Soon, scientists observed a large mountain chain running down the center of the Atlantic ocean.
They quickly found that the ridge ran around the world They quickly found that the ridge ran around the world!
Harry Hess : American Geologist
Harry Hess No! Harry Hess, not Harry Potter!
Sea-Floor Spreading Harry Hess 1960
An American geologist who studied mid-ocean ridges. He suggested that the ocean floors move like conveyor belts, carrying the continents along with them.
Pillow Rock forms when magma cools in water. This is evidence of volcanic activity!
This shows you the age of the sea floor. The red areas are new rocks and the blue areas are the oldest oceanic rock.
Iceland is spreading open on the Mid- Atlantic Ridge!
Can you see where the Mid-Atlantic Ridge bisects Iceland? This is a rift valley!
Sea Floor Spreading Evidence pillow lava magnetic stripes Drilling rock samples
If new crust is being added to Earth’s surface, is Earth getting bigger?
Subduction is a process where the ocean floor sinks back into the mantle at a deep ocean trench.
Sea Floor Spreading The Mid-ocean Ridge Vocabulary Sonar Sea-floor spreading Deep-ocean trench Subduction Mid-ocean ridge.
I can: describe what happens during Sea Floor Spreading DO NOW: What is a Mid- ocean Ridge?
Sea Floor Spreading The Mid-ocean Ridge Vocabulary Mid-ocean ridgeMid-ocean ridge SonarSonar Sea-floor spreadingSea-floor spreading Deep-ocean trenchDeep-ocean.
Sea-Floor Spreading Key Concepts What is the process of sea-floor spreading? What is the evidence for sea-floor spreading? What happens at deep-ocean trenches?
FQ: How could continents move apart? 1. Think, pair, share 2. Write your ideas in your scientist notebook.
Sea Floor Spreading Chapter 1-4. Mid Ocean Ridges Mapped by sonar in mid 1900’s Curve like seams on a baseball along the sea floor Extend across all oceans.
Sea- floor Spreading Scientists have mapped the ocean floor and mid-ocean ridge using S.O.N.A.R. Sound waves bounce off the underwater objects and then.
Section 4: Sea-Floor Spreading What is the process of sea-floor spreading? What is the evidence for sea-floor spreading? What happens at deep-ocean trenches?
1.4 Sea-floor Spreading Check your notes for key ideas!
The Theory of Seafloor Spreading. Seafloor Bathymetry Creating Maps of the Ocean Floor Scientists were able to map the ocean floor using sonar, an Echo-
Continental Drift. Continental Drift Theory Most other scientists did not feel Wegener’s theory was true. That was because Wegener couldn’t come up with.
Plate Tectonics. Theory of Plate Tectonics Meaning – “plate structure” Developed – 1960’s Explains the movement of Earth’s plates, causes of volcanoes,
Mid-Ocean Ridge Is an undersea mountain chain that is part of a long system of mountains that winds beneath Earth’s oceans.
Plate Tectonics. Theory of Plate Tectonics Meaning – “plate structure” Developed – 1960’s (50 years after Wegener) The Earth is divided into approximately.
9-4 Sea Floor Spreading 1. What is the process of sea-floor spreading? 2. What happens to the ocean floor at deep ocean trenches.
Ch5 Sec4 Sea-Floor Spreading. Key Concepts What is the process of sea-floor spreading? What is the evidence for sea-floor spreading? What happens at deep-ocean.
Sea-floor Spreading Section 1.4. Mid-Ocean Ridges In the mid 1900’s scientists discovered that the ocean floor is not flat. huge mountains deep trenches.
Sea-Floor Spreading. Tubeworms have no mouth, eyes, or stomach. These bacteria convert the chemicals that shoot out of the deep sea vents into food for.
Sea-Floor Spreading. Was Wegener Right? Recently, new technology has given us new clues into drifting continents. Wegener’s theory of drifting continents.
Sea-Floor Spreading. Sea-Floor Spreading –the process that continually adds new material to the ocean floor while pushing older rocks away from the ridge.
In the mid-1900’s, scientists realized that the ocean floor had many mountain ranges similar to those on the continents. These underwater mountain ranges.
Sea Floor Spreading Year 1 Science. Sea Floor Spreading Harry Hess created the theory of sea-floor spreading The theory states the following: -The.
Sea Floor Spreading Inside Earth Ch Introduction A. Deep in the ocean the temp is near _freezing_(0 C) B. Many things live in the deep ocean.
Sea-Floor Spreading. Introduction Tube Worms - live in the Pacific Ocean about one mile deep near the hydrothermal vents.
Bellringer What three specific types of evidence did Wegener study that led to him creating the idea that the continents had moved?
Sea Floor Spreading EQ: What is the process of sea-floor spreading?
Sea-floor Spreading and Changing Earth’s Surface.
Mid-Ocean Ridges Mid-ocean ridges are an undersea mountain chain where new ocean floor is produced. In the mid-1900’s, scientists begin mapping the mid-
3.2 Sea-Floor Spreading. Convection Currents cause the sea floor to spread.
Sea-Floor Spreading. Tubeworms have no mouth, eyes, or stomach ("gut"). Their survival depends on a symbiotic relationship with the billions of bacteria.
Plate Tectonics Seafloor Spreading. Plate Tectonics 4 – Name the four main layers of the earth from inside to outer most layer. 3 – Name the three physical.
Sea-Floor Spreading Chapter 1, Section 4 Pages
On your puzzle from last class: Answer the following questions in COMPLETE sentences: 1.What five pieces of evidence supports Wegner’s Theory of Continental.
Sea-Floor Spreading. Mapping the mid-ocean ridge The East Pacific Rise has a mid-ocean ridge. Curves around like a baseball. Lies hidden under hundreds.
Sea-Floor Spreading. Who developed the theory of continental drift? A)Wegener B)Einstein C)Beethoven D)Alexander Graham Bell.
Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.
Lesson 6 Date: 1/19 LT: I can describe the processes that change Earth’s surface. Sponge: Where are earthquakes most likely to occur?
Sea-Floor Spreading Chapter 3 Lesson 4
Sea Floor Spreading Chapter 4 Section 4 Standard S 6.1 Students know evidence from plate tectonics is derived from the fit of the continents and mid.
Sea Floor Spreading So… now that we know that about 250 million years ago there was one big super continent called Pangaea. What caused it to move apart?
Sea Floor Spreading. Describe the Diagram Sea Floor Spreading A process in which new ocean floor is created as molten material from the earth's mantle.
Chapter One: Plate Tectonics Section 4: Sea-Floor Spreading Pages
Sea-Floor Spreading. Learning Target I will explain the evidence for and process of sea-floor spreading.
Chapter 2: Plate Tectonics Lesson 1 Objective #3.
Continental Drift Theory Proposed by Alfred Wegener in million years ago, all of the continents were combined into one super-continent called.
Development of Sea Floor Spreading DSDP 1950,s. SONAR.
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