Section 12-2. Midocean Ridges Underwater mountains Ex. Mid-Atlantic Ridge Form the smallest mountain chains They have a great amount of volcanic activity.

Slides:

Advertisements

Similar presentations

 Tectonic Plates – the massive, irregularly shaped slabs of rock that make up the Earth’s lithosphere  One plate cannot shift without affecting the.

Advertisements

1.1 Earth has several Layers.  Denser material sinks  Less dense material rises to the top.

Plate Tectonics.

Sea floor Spreading Aim: Is the ocean getting bigger?

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?

EQ: What is the theory of plate tectonics?

Trench When two plates of oceanic crust collide, one plate sinks beneath the other. One of the plates is pushed beneath the deep-sea trench down toward.

Chapter 7 Earth’s Moving Crust

Types of Plate Boundaries

Major Geological Events Caused by Plate Tectonics

How are these like the mantle?

 The cracked eggshell is similar to the cracks in Earth’s lithosphere.

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

Chapter 3 Plate Tectonics

Ch. 4.2 The Theory of Plate Tectonics

The Changing Earth Chapter 9: Plate Tectonics. Review Earth Has Several Layers.

Plate Tectonics Causes of Plate Tectonics Plate Boundaries.

Plate Tectonics Chapter 17. The Earth’s Drifting Continents German scientist Alfred Wegener, 1900’s proposed the Theory of Continental Drift It was.

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?

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.

Theory of Plate Tectonics. Plates Meet at Boundaries Hot, mantle moves the plates. Tectonic Plates.

Theory of Plate Tectonics The lithosphere is broken into separate sections called plates The theory of plate tectonics states that the pieces of Earth’s.

Plates Move. Schedule Plate Movement Notes15-20 minutes ABCD Card Review10 Minutes Comic Strip Activity30-40 Minutes Exit ticket5-10 Minutes.

Theory of Plate Tectonics. How do we know the plates exist?  Earthquake and Volcano Zones  Ocean floor features (Trenches and Mid-Oceanic ridges)

1 2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt Pulling me apart Pulling me apart.

Plate Tectonics Earth Science. Continental Drift Alfred Wegener proposed the idea of continental drift in Looking at the continents, it is possible.

Plate Tectonics. The Theory of Seafloor Spreading 1.On the ocean floor there are areas where the seafloor is getting bigger. 2.Researchers used sound.

Ch. 6 Plate Tectonics.

Tectonic Plate Boundaries

Earthquakes, Volcanoes & The Ring of Fire. 1. Convection in Earth’s Mantle—heat from Earth’s core and the mantle itself cause convection currents in the.

Theory of Plate Tectonics. Theory of Continental Drift The Theory of Plate Tectonics starts with another idea… Continental Drift. The Earth once had a.

Intro Objective 10/5/11 Describe the three types of tectonic plate boundaries. What do you think forms when two tectonic plates collide? What about when.

The Theory of Plate Tectonics Earth’s crust is made of many ________ These plates move as a result of ______________ in the mantle Earth’s surface is.

Essential Question: How does the constant movement of lithospheric plates cause major geological events on the earth’s surface? Standard: S6E5e. Recognize.

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.

Inside Earth: Chapter 1- Plate Tectonics Section 4: Sea-Floor Spreading.

Plate Tectonics. Wilson- combined Continental Drift, Sea- Floor Spreading. A geologic theory that states that pieces of Earth’s lithosphere are in constant,

Forces that Shape the Earth

J. Tuzo Wilson was a Canadian scientist.

Mid Ocean Ridge and Other Plate Boundaries

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

Hess reasoned that if the ocean floor was moving away from either side of the midocean ridge. Then it must be colliding somewhere else, such as the.

Types of Plate Boundaries After completing this section, students will identify that the Earth is made of geologic plates (Standard PI-041) and investigate.

Plate Tectonics.

Theory of Plate Tectonics Chapter 10.3 pg SPI

The Theory of Plate Tectonics The Earth’s crust is broken up into plates which move around on top of the mantle **Driven by convection currents**

Plate Tectonics. Theory of Continental Drift The theory that continents drifted across the ocean to get their current spots on the globe. First suggested.

Plate Tectonics. Plate Tectonics explained by a 7 yr old…

Plate Tectonics Test Review

Plate Boundaries JOURNAL PAGE 65.  The edges of the plates meet at lines called plate boundaries.  When rocks slip past each other along these boundaries.

Handout Standard 2 Objective 3.a, b, c, and d Plate Tectonics 3.

Bell Ringer 2/8/2016 Which plate is thicker and less dense? Continental Plate or Oceanic Plate.

 Lithosphere is broken into huge plates and float on the asthenosphere. How Plates Move.

Sea-floor Spreading and Changing Earth’s Surface.

Theory of Plate Tectonics. How do we know the plates exist?  Earthquake and Volcano Zones  Ocean floor features (Trenches and Mid-Oceanic ridges)

Warm up  Which landform is most likely to form where two oceanic plates push together?  A. folded mountains  B. mid-ocean ridge  C. river valley 

A. The theory that pieces of the Earth’s lithosphere, called plates, move slowly on top of the asthenosphere B. Explains the formation and movement of.

Major Geological Events

Sea Floor Spreading.

Plate Tectonics.

Chapter One: Plate Tectonics

Plate Tectonics.

Plate Tectonics.

Earth Part 3 G. Yannakoulias.

Earth Part 3 G. Yannakoulias.

The Earth’s Drifting Continents

Plate Tectonics The Earth is broken into 20 or so lithospheric plates which are “riding” on the hotter asthenosphere.

Presentation transcript:

Section 12-2

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

MIDOCEAN RIDGES

Ocean – Floor Spreading Occurs along midocean ridges Process that explains continental drift Lava erupts from riff valley causing ocean floor to spread New ocean floor when it hardens Rock near midocean ridge is younger

Ocean – Floor Spreading and Magnetic Stripes Magnetic stripes in ocean floor rocks line up with poles but the Earth’s magnetic poles reverse from time to time giving good evidence.

Ocean Floor Spreading does not make Earth’s Surface larger because it is being destroyed as fast as it is being made

 Deepest part of the ocean  V-shaped valleys along the ocean bottom near continents or island

SubductionOlder ocean floor moves down deep into the Earth along trenches When deep enough, the rock melts becoming part of the mantle Denser materials go down and less dense float

Transform Faults Thin cracks located between sections of oceanic ridges Rock on either side of the fault are moving in opposite directions Block tend to jam rather than slide smoothly past one another which causes stress to built up When rock does suddenly slip it causes earthquakes