Plate Tectonics

The youngest rocks on the ocean floor are located

Which scientist proposed the theory of seafloor spreading?

When one plate sinks below another plate, it pulls on the rest of the plate, resulting in _.

This tectonic plate is the largest.

Matching _ on different continents are evidence for continental drift.

There is less thermal energy near mid-ocean ridges.

There are _forces that cause tectonic plate boundaries.

occurs when new oceanic crust forms at mid-ocean ridges & old crust moves away from the ridge

What was the name of the supercontinent that once existed on Earth?

Which scientist developed the theory of continental drift?

Molten material below Earth's surface is called

Scientists are now able to measure how the continents move.

Which scientist proposed the theory of plate tectonics?

Many early mapmakers thought Earth's continents had moved based on

Wegener's theory was not accepted because he could not prove how the continents moved.

One piece of evidence for seafloor spreading is the magnetic reversal of rocks.

_ pushes plates away from each other at mid-ocean ridges.

_ occurs when the plates are moved by convection currents.

When two plates collide, a _ plate boundary occurs.

The hypothesis that continents have slowly moved to their current location is called

In the 1940s, technology was used to map the depth of the oceans.

A _ plate boundary occurs when two plates separate.

How does seafloor spreading support continental drift?

The place where two plates meet is called a(n)

Bands of rock on the seafloor showing alternate magnetic orientation indicates

_ is the process in which the denser plate slides under the less-dense plate.

__ occur at transform plate boundaries.

The presence of the same __ on several continents supports the hypothesis of continental drift.

Plate tectonics is able to explain why volcanoes and earthquakes happen in certain places.

A _ plate boundary occurs when two plates slide by each other.

_ form when two continental plates collide and neither is subducted.

Sediment age and thickness increases are you move away from a mid-ocean ridge.

Older, cooler, denser rock is found farther from the mid-ocean ridges than newer rock.

Mid-ocean ridges are longer than any mountain range on land.

This part of the mantle is so hot that it flows like plastic.

In the middle of the oceans are large mountains ranges called

The plates are part of Earth's