The youngest material of the ocean floor is found at mid-ocean _________.

• ridges
• trenches
• basins
• rifts

The presence of the same ________ on several continents supports the idea of continental drift.

• rocks
• fossils
• both fossils and rocks
• neither fossils nor rocks

A lack of evidence for continental drift prevented many scientists from believing a single supercontinent called _________ existed.

• Glossopteris
• Pangaea
• Gondwanaland
• Mesosaurus

The theory of _______ states that Earth’s crust and upper mantle are broken into sections that are in constant, slow motion.

• plate tectonics
• continental drift
• seafloor spreading
• divergent boundaries

Matching ________ on different continents are evidence for continental drift.

• weather systems
• river systems
• rock structures
• wind systems

Many scientists think hot plastic-like rock in the mantle is forced upward toward the surface, cools, and sinks.  This process is called a(n) _________.

• earthquake
• convergent boundary
• volcano
• convection current

The _________ is the thinnest layer of Earth.

• outer core
• inner core
• mantle
• crust

_______ are formed when two continental plates collide.

• Mountain ranges
• Transform faults
• Rift valleys
• Volcanoes

The theory of continental drift was first proposed by __________.

• Thomas Edison
• Alfred Wegener
• Benjamin Franklin
• Harry Hess

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The theory of seafloor spreading was first proposed by __________.

• Thomas Edison
• Harry Hess
• Benjamin Franklin
• Alfred Wegener