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

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

A German scientist Alfred Wegener was the first to hypothesize that ...........

• Continents were once joined
• The sea floor is spreading
• Continents are moving
• The Earth's magnetic pole flips

Pangaea was an ancient supercontinent made up of...

• America, Greenland, and Europe.
• Antarctica, India, and America.
• all of Earth’s continents.
• South Africa, India, Australia, and South America.

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.

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

• convection.

• continental drift.

• subduction.

• conduction.

The geological theory of _______ states that pieces of Earth’s lithosphere are in constant, slow motion.

• subduction

• plate tectonics

• deep-ocean trenches

• sea-floor spreading

Below is a picture of sea-floor spreading. How are the ocean crusts moving?

• Converging

• Diverging

• Sliding

• No movement

What are the two types of crust

• continental and oceanic
• ocean and upper
• lower and upper
• pizza and subway

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

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

What are Tectonic Plates?

• A continent 
• The Trees in Vietnam 
• ThE PlaTES That MoVE uNdERGRound :)
• The Plates that move the Continents