Sea Floor Spreading.

Slides:

Advertisements

Similar presentations

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

Advertisements

So what has caused the continents to drift ??

Plate Tectonics.

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?

Types of Plate Boundaries

Plate Tectonics Mr. Q and Mrs. Wolfe 6 th Grade Earth Science.

Plate Tectonics Mrs. Anton. Continental Drift Caused By Plate Tectonics.

SEA-FLOOR SPREADING TXT: PG. 97 CHAPTER 3, SECTION 4.

Chapter 7 Section 1: Continental Drift Section 2 : Sea Floor Spreading

Obj: What is the Theory of Plate Tectonics? Copy the following questions in your notebook: TABLE 1 (7)- What is a mid ocean ridge? TABLE 2 (8)-What is.

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 4 main layers. 1.Crust (rock) 2.Mantle (rock) 3.Outer Core (metal) 4.Inner Core (

Plate Tectonics Plate tectonics is the theory that explains why and how continents move and is the study of the formation of features in the earth’s crust.

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.

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 4 main layers. 1.Crust (rock) 2.Mantle (rock) 3.Outer Core (metal) 4.Inner Core (

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

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

 Plate Tectonics refers to the movements of plates (large segments of continents and ocean) around the Earth’s surface.  These land masses are seen.

PART 1: The Theory of Continental Drift is a hypothesis that states the continents once formed a large, single landmass called Pangaea.

The Theory of Plate Tectonics and Continental Drift Write down the underlined items for your notes. Feel free to put the material in your own words.

Do Now Silently & Independently answer the questions on the chart on your desk. 1.What is continental drift? 2.Why didn’t people believe continental drift.

Sea-floor Spreading and Changing Earth’s Surface.

Crustal Features and plate boundaries

Earth’s Structure.

Theory of Plate Tectonics

Plate Boundaries: Divergent, Convergent, and Transform

Continental Drift Theory

Plate Tectonics - Part A - Theory of Plate Tectonics

Plate Tectonics The crust in motion.

A new theory that combined continental drift and seafloor spreading was developed known as the theory of Plate Tectonics.

Sea-Floor Spreading /phsciexp/internet_activity/cfd- 1014_midocean.html.

CONTINENTAL DRIFT & PANGEA

Continental Drift & Plate Tectonics Notes

Plate Tectonics.

PLATES AND TECTONIC MOVEMENT

Plate Tectonics 1: Continental Drift -Evidence of continental drift

Continental Drift Theory

Plates and Plate boundaries

Plate Tectonics Mr. Q and Mrs. Wolfe 6th Grade Earth Science.

PLATES AND TECTONIC MOVEMENT

Plate Tectonics.

Earth’s Changing Structures

PART 1: The Theory of Continental Drift is a hypothesis that states the continents once formed a large, single landmass called Pangaea.

Chapter 10 Plate Tectonics.

Continental Drift.

Plate Tectonics.

During the 1940s and 1950s, using technology developed during World War I, scientists began using sound waves to map the ocean floor.

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.

Continental Drift and Seafloor Spreading Notes

Plate Tectonics Mr. Q and Mrs. Wolfe 6th Grade Earth Science.

Seafloor Spreading and Plate Tectonics

Plate Tectonics The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

Earth Part 3 G. Yannakoulias.

PLATE BOUNDARIES.

Plate Tectonics.

Earth Part 3 G. Yannakoulias.

Continental Shelf: the area from the shore line to the continental slope Continental Slope: the area of the ocean floor from the end of the shelf to the.

Jeopardy Final Jeopardy Tectonic Plates Divergent Transform Convergent

Unit 1 Vocab Earth Science Unit

Continents change position over time

Earth’s Structure and Pangaea

Earth’s Structure and Pangaea

Earth’s Structure and Pangaea

Sea Floor Spreading.

Divergent Plate Boundaries

The Unifying Theory of Earth Science

Plate Boundaries: Divergent, Convergent, and Transform

Seafloor Spreading.

Presentation transcript:

Sea Floor Spreading

Crust – Earth’s Outer Layer There are two kinds of crust on the Earth Continental Crust Makes up the continents Oceanic Crust Is found under the oceans Is denser than continental

Mid-Ocean Ridges Are openings in the Earth’s crust Part of underwater mountain ranges on the ocean bottom (longest on Earth) Above the surface they are islands (ex. Iceland) Deep cracks in the center allow magma to come out, harden, and form new sea floor As new magma comes up, it pushes the sea floor further apart

It is this spreading of the sea floor that drives the movements of the continents (continental drift)!!!

Mid-Atlantic Ridge (and others)

Rift Valleys The flat area between two ridges, formed from crust spreading apart Lots of earthquakes and volcanoes occur here Magma comes out of the ocean floor here

Ocean Trenches Very deep area where ocean crust meets continental crust Subduction Zone: place where old oceanic crust is forced under continental crust, back into the mantle at an ocean trench

Age of the Seafloor Young ocean crust = middle of ocean floor Magma coming out of rift cools, forms new rock Old ocean crust = far away from ridge Rocks are older because they were pushed away from the ridge

Disappearing Ocean Crust Oldest ocean floor rocks are only 160 million years old (earth is 4.6 billion years old)

Complete the following… Define: Sea Floor Spreading List evidence that supports it: