SEAFLOOR SPREADING Atlantic Getting Bigger B40b. SEAFLOOR SPREADING Idea that the ocean bottom is getting larger. Atlantic Ocean Proposed by Harry Hess.

Slides:

Advertisements

Similar presentations

Sea Floor Spreading The Mid-ocean Ridge Vocabulary Sonar Sea-floor spreading Deep-ocean trench Subduction Mid-ocean ridge.

Advertisements

The Changing Earth Chapter Eleven: Plate Tectonics 11.1 Pangaea 11.2 Sea Floor Spreading 11.3 Plate Boundaries.

Check your notes for key ideas!

After studying the continental drift theory you have an idea of what Earth looked like million years ago. Hypothesize about what Earth will look.

Sea Floor Spreading The action at divergent plate boundaries. By Diana L. Duckworth Rustburg High School Campbell County, VA.

Lab 4-3: Sea-Floor Spreading

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.

Earth Science Standard 3.a - Students know features of the ocean floor (magnetic patterns, age, and seafloor topography) provide evidence of plate tectonics.

Sea-Floor Spreading. Was Wegener Right? Recently, new technology has given us new clues into drifting continents. Wegener’s theory of drifting continents.

The Theory of Sea Floor Spreading Page 99. Sea Floor Spreading Harry Hess (1960) as the ocean floor spreads apart, new crust material rises from the mantle.

Plate Tectonics Section 1 Section 1: Continental Drift Preview Key Ideas Wegener’s Hypothesis Sea-Floor Spreading Paleomagnetism Wegener Redeemed Continental.

Earth Science Evidence for the SLOW CHANGES we can’t see.

FQ: How could continents move apart? 1. Think, pair, share 2. Write your ideas in your scientist notebook.

Chapter 4: Plate tectonics The evidence for the theory of plate tectonics has been accumulating for 400 years. It is only since the 1960’s that this theory.

Describe evidence for the mechanism behind continental drift. 1.Describe 1 evidence for continental drift AND how it supports the theory. 2.Why was the.

What is Plate Tectonics Theory? Use this part of the PPT for p. 7 of your INB!!!

Plate Tectonics. Theory of Plate Tectonics Meaning – “plate structure” Developed – 1960’s Explains the movement of Earth’s plates, causes of volcanoes,

EQ: What is the process of sea-floor spreading?

Chapter 1, Section 4 Pages 33-39

3.2 Sea-Floor Spreading. Convection Currents cause the sea floor to spread.

Sea-Floor Spreading.

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-

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 Year 1 Science. Sea Floor Spreading  Harry Hess created the theory of sea-floor spreading  The theory states the following: -The.

Continental Drift. Note the Shapes South America & Africa: They Match! What about any others? North America?

I can: describe what happens during Sea Floor Spreading DO NOW: What is a Mid- ocean Ridge?

Plate Tectonics and Continental Drift. Continental Drift Alfred Wegener believed that the continents were once connected. This large continent was called.

Evidence for Continental Drift Wegener (1915) proposed Pangaea – one large continent existed 200 million years ago Wegener (1915) proposed Pangaea – one.

Section 4: Sea-Floor Spreading

Sea Floor Spreading Inside Earth Ch. 1.4

Chapter 2: Plate Tectonics Lesson 1 Objective #3.

Section Midocean Ridges Underwater mountains Ex. Mid-Atlantic Ridge Form the smallest mountain chains They have a great amount of volcanic activity.

Sea Floor Spreading The Mid-ocean Ridge Vocabulary Sonar Sea-floor spreading Deep-ocean trench Subduction Mid-ocean ridge.

 Please get your science notebook and be in your assigned seat.  Get out your plate boundaries map from yesterday.

DEVELOPMENT OF A THEORY Page 47 of INB. ESSENTIAL QUESTION  Explain the evidence used to support seafloor spreading.

Sea-Floor Spreading Chapter 1, Section 4 Pages

Proving Wegener. Mid Ocean Ridge The Mid-Atlantic Ridge is part of under-seas Mountain Range known as Mid-Ocean Ridge The rocks found on Continents are.

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.

Lesson 6 Date: 1/19 LT: I can describe the processes that change Earth’s surface. Sponge: Where are earthquakes most likely to occur?

Day 26  You will use the theory of plate tectonics and the changes in the earth’s surface in order to explain and discuss the evidence for seafloor.

Sea Floor Spreading The Mid-ocean Ridge Vocabulary Sonar Sea-floor spreading Deep-ocean trench Subduction Mid-ocean ridge.

Seafloor Spreading What evidence do scientists have to support the fact that the Earth’s crust is continuously moving?

Seafloor Spreading. Seafloor Spreading Video Wegener could not explain how the continents moved but... Harry Hess explained HOW continents moved and.

Part II The rest of the Story!.   About 20 years after Wegener’s death, the missing mechanism was discovered. Several scientist were mapping the middle.

Sea-Floor Spreading.

Plate Tectonics. Theory of Plate Tectonics Meaning – “plate structure” Developed – 1960’s (50 years after Wegener) The Earth is divided into approximately.

Plate Tectonics. Outline  Pangaea  Continental Drift  Mid-ocean ridges and seafloor spreading  Magnetic patterns on the seafloor  Plate tectonics:

Continental Drift Notes

Earth Science Historical Introduction Sea Floor Spreading & the Earth’s Magnetic Field.

Plate Tectonics Plate movement is driven by convection currents.

Seafloor Spreading (still continuing ch. 4.1).  Underwater mountain range called the Mid-Atlantic Ridge discovered in  Part of an 80,000-km-long.

Open internet for Slide 6, Slide 7 Go to favorites and open animations and look for sea floor spreading and convection in the mantle and open…right click.

PLATE TECTONICS Part 2. Geographic Puzzle _______________ noted that Africa and South America appear to fit together neatly, like the pieces of a jigsaw.

The Theory of Sea Floor Spreading

Sea-floor Spreading and Changing Earth’s Surface.

Seafloor Spreading Lab

Section 1: Continental Drift

Chapter 10 Section 1 Notes Continental Drift.

Plate Tectonics Continental Drift.

Sea-Floor Spreading.

Sea Floor Spreading.

Evidence after wegener: seafloor spreading and PALEOMAGNETISM

Sea-Floor Spreading Notes

Sea- floor Spreading The longest chain of mountains in the world is the Mid-Ocean Ridge. Scientists have mapped the ocean floor and mid-ocean ridge using.

Sea Floor Spreading Chapter 4.4.

Do now: Read 4.2.

Do Now: Video Clip While watching the following clip answer the following: Is it possible for our oceans to be splitting apart? Is there a name for this?

Do Now: Video Clip While watching the following clip answer the following: What did Harry Hess discover? What did he call his discovery?

Sea Floor Spreading The Mid-ocean Ridge.

THE PROOF-----SEAFLOOR SPREADING

Presentation transcript:

SEAFLOOR SPREADING Atlantic Getting Bigger B40b

SEAFLOOR SPREADING Idea that the ocean bottom is getting larger. Atlantic Ocean Proposed by Harry Hess Evidence in rocks on ocean floor.

MID-ATLANTIC RIDGE mid-ocean ridge found running down center of Atlantic Ocean series of mountains on either side

ROCK AGES 1 - youngest rocks nearest the ridge oldest rocks next to continents identical pattern on both sides THEREFORE: new rocks are forming (B3, Figure 9)

2 - oldest rocks on ocean floor = 200 million years old oldest rocks on continents = 4.6 billion years old THEREFORE: new rocks are forming (B3, Figure 9)

MAGNETIC REVERSAL INDICATORS rocks on ocean bottom reflect earth’s magnetic reversals THEREFORE: new rocks areforming (B3, Figure 10)

ASSIGNMENT Draw a section of the ocean floor and mantle flanking the mid-Atlantic ridge. Use different colors to represent different rock ages. Label: mid-Atlantic ridge and direction of plate movement.