2.Plate tectonics and continental drift.

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2.Plate tectonics and continental drift. : 

2.Plate tectonics and continental drift. Learning objective:To be able to describe and explain by making links.

Learning objectives : 

How old is the Earth? Learning objectives

Slide 3: 

The Earth is… 2 million years old 30 million years old 100 million years old 4600 million years old How old is the Earth?

Slide 4: 

India collides with Asia – 50 m Formation of the Alps – 30 m Dinosaur extinction – 65 m Man (Homo sapiens) inhabits the Earth – 0.1 m Industrial Revolution (UK) - 0.00015 m You were born! – 0.000013 m First flowers appear – 100 m Mark the following events on your time line. What do you notice? (figures are in ‘million years ago’) 4,600 today million years ago 1,000 2,000 3,000 4,000 History of the Earth

Slide 5: 

History of the Earth People (Homo sapiens) only appeared 100,000 years ago! Big Bang! Dinosaurs die out Men-like apes Homo sapiens

Learning objectives : 

What is Continental drift? Learning objectives

Slide 8: 

In 1912, a German scientist called Alfred Wegener proposed that South America and Africa were once joined together and had subsequently moved apart.  He believed that all the continents were once joined together as one big land mass called Pangaea and this was intact until about 200 million years ago. The idea that continents are slowly shifting their positions is called continental drift.

Slide 9: 

Evidence for continental drift Study of fossils Similar fossils are found on different continents. This is evidence that these regions were once very close or joined together. Pattern of rocks Similar pattern of rock layers on different continents is evidence that the rocks were once close together or joined.

Slide 10: 

Continental drift

Why? : 

Why? http://www.enchantedlearning.com/cgifs/Continentaldrift.gif

Learning objectives : 

What is Plate Tectonics? Learning objectives

Slide 13: 

The Earth's surface is made up of a number of large plates (like pieces of a jigsaw puzzle) that are in constant, slow motion. At the edges of these plates (plate boundaries) earthquakes and volcanoes occur. Convection currents in the mantle move the plates. Wegener knew the continents had drifted but he couldn't explain how they drifted. It wasn't until the 1960's that geologists used ocean surveys to explain continental drift with the theory of Plate Tectonics.

Slide 14: 

Why do the plates move?

Slide 15: 

Plate names African Indo-Australian Plate North American South American Eurasian Pacific Nazca Antarctic Pacific

Slide 16: 

Can you name plates A and B? A B African Plate Indo-Australian Plate Plate names

Slide 17: 

Plate names

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