Plate Tectonic History

Courtney D. 1/20/15 Sixth Period

1. What evidence did Alfred Wegener use to support his theory of continental drift?

He showed people that South America and Africa could fit together like a puzzle piece, He was trying to tell people that all the continents were once together. That was called Pangea ( meaning all earth ).

2. Why do you think people didn't believe the continental drift theory when Wegener first explained it?

Because he couldn't come up with an acceptable way that the continents were moving closer together, so people didn't believe him.

3. Who were the 2 scientist that brought forth supporting evidence to Wegener's theory and what was their evidence?

It was Arthur Holmes and Harry Hess who brought more supporting evidence to Alfred Wegener's theory. They suggested that the continents didn't just drift away they were "carried" by larger pieces of the earth's crust.

5. What types of movement can occur between plates and what features can form from this moment?

Plates can collide, separate, or slide past each other to create earthquakes, volcanoes, mountain ranges, ocean trenches, and rift valleys. An example of a divergent boundary is Africa's Great Rift Valley, an example of a convergent boundary is the Himalaya mountains, and an example of a transform boundary is San Andreas Fault, in California.

6. What do plate tectonics and ocean trenches have in common?

What they have in common is that the process takes place at a convergent plate boundary by which one tectonic plate moves under another tectonic plate that is called subduction.

7. How old are the rocks off East Coast of North America in relation to the rocks right along the Mid-Atlantic ridge?

The rocks off the East Coast of North America are about 4.6 billion years old. Because when the Earth was formed, the rocks were formed at the same time, so the Earth and the rocks are the same age.

8. What is a convection current and how does it work?

A convection current is the internal movement of the flow of hot liquids in a circular motion in the earth's mantle caused by heating and cooling.

9. What are the 7 major plate boundaries?

The North American Plate, South American Plate, Eurasian Plate, African Plate, Indian Plate, Pacific Plate, and the Antarctica Plate.

10.What are two bad events that can happen as a direct result of plate tectonics?

Two bad events that can happen as a direct result of plate tectonics are earthquakes and volcanoes. An earthquake occurs when the plates slide past each other which is called a Transform Plate Boundary. Volcanoes occur when the denser plate goes under the other plate that is called Subduction Plate Zone.

11. What are three good things that plate tectonics provide for humans?

Three things the plates provide are fertile soils, ore deposits, and fossil fuels. Over thousands to millions of years, the physical breakdown and chemical weathering of volcanic rocks have formed some of the most fertile land on the earth's crust. Active volcanic vents along the spreading mid-ocean ridges create ideal environments for the circulation of liquids rich in minerals for ore deposits. Oil and natural gasses are the product of the deep burial and decomposition of accumulated organic material in geologic basins that flank mountains ranges formed by plate tectonic processes. All of the these are made from volcanoes.