A Level - Earth Structure and Plate Movement

The Asthenosphere is the...

• upper part of the crust

• upper part of the mantle

• upper part of the inner core

• upper part of the outer core

True or False - the inner core is made from molten iron and nickel

• true

• false

The core's temperature is around...

• 3000C

• 4000C

• 5000C

• 6000C

Which of the following is NOT a characteristic of oceanic crust?

• Fast moving

• Basalt

• Younger

• Less dense

True or False - continental crust "floats" on the mantle, a little like an iceberg

• True

• False

What is the average rate of plate movement around the world?

• 2-5cm per year

• 5-10cm per year

• 8-15cm per year

• 14-18cm per year

The process driving plate movement that occurs as a result of differential heating in the mantle

• ridge push

• slab pull

• convection

• subduction

True or false - friction plays a role within the process of convection (& resulting plate movement)

• True

• False

Which of the following processes occurs as a result of the "weight" of an oceanic plate sinking into the mantle

• slab pull

• ridge push

Which of the following occurs at constructive plate margins (where plates are moving apart)

• slab pull

• ridge push