Plate Tectonics

Early observers thought continents may have been joined based on what observations

• rocks and fossils
• earthquakes.
• magnetism.
• coastline

One of the fossils Wegener used to support his hypothesis of continental drift was

• Glossopteris
• Trilobite
• insects in tree amber
• ammonite molds

This is the driving force behind the movement of tectonic plates.

• Mantle convection currents
• Oceanic convection currents
• Atmospheric convection currents
• Solar convection currents

What two mechanisms do scientists think help convection currents in mantel move plates?

• Ridge push and Slab pull
• Normal and Reversed magnetism
• Action and Reaction tectonic forces 
• Gravitational and Rotational pull

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.

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

Mountains form from ...

• plates sliding past one another
• collision of plates
• plates moving away from each other

Identify the Major Plate labeled L

• Indo-Australian Plate
• North American Plate
• South Americana Plate
• Eurasian Plate 

What are the puzzle pieces of the Earth's surface called?

• Tectonic plates
• Puzzles
• Earthquakes

The area around the Pacific Ocean where lots of earthquakes and volcanoes happen is called the ____________.

• Ring of Earth
• Ring of Fire
• Ring of Stone
• Ring of Diamond