Plate Tectonics - HEES

In sea-floor spreading, molten material rises from the mantle and erupts

• along the edges of all the continents.

• along mid-ocean ridges.

• in deep-ocean trenches.

• at the north and south poles.

The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as _______

• convection.

• continental drift.

• subduction.

• conduction.

Most geologists think that the movement of Earth’s plates is caused by _______

• convection.

• continental drift.

• subduction.

• conduction.

How is it possible for new crust to be formed without increasing the surface area of the Earth?

• Crust is destroyed at the same time it is created
• New crust is underwater where it sinks
• New crust breaks more easily than old crust

The Himalayas in Asia are an example of what type of plate boundary?

• divergent
• continent-to-continent convergent
• ocean-to-continent convergent
• transform

Evidence used by Wegener to supported his idea of continental drift included

• Ocean rocks and sediments
• Ocean floor topography
• Magnetic isochron patterns
• Climatic data

What is the outer core made of?

• solid rock
• solid metal
• melted rock
• melted metal

Which type of crust has the oldest rock?

• oceanic, because it creates mid-ocean ridges

• oceanic, because it is more dense and subducts

• continental, because it forms rift valleys

• continental, because it is less dense and never subducts

Which layer causes the earth's magnetic field?

• inner core
• outer core
• mantle
• crust

What type of event will occur at this boundary?

• Earthquake

• Volcano Eruption

• Tornado

• Mountain Building