Theories
Boundaries
Seafloor
Spicy
100

According to Wegener’s hypothesis of continental drift,

the continents were once joined together in a single landmass.

100

A place where two plates collide is called?

convergent boundary

100

The process of _________________________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.

sea floor spreading

100

The transfer of energy through light rays is called

Radiation

200

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

plate tectonics

200

Along a _______________ boundary, two plates slip past each other, moving in opposite directions.  

transform

200

Old oceanic crust is more dense than new oceanic crust because it is

cool

200

Particles of hot soup rise slowly in a pot simmering on a stove. As the hot soup nears the surface, it begins to cool. The cooler soup sinks, forming a constant movement of soup that moves energy toward the surface of the pot. This constant movement of the soup in the pot is called a(n)

Convection current

300

The hypothesis of _________________________ was that all the continents once were joined as a single supercontinent and have since drifted apart.

continental drift

300

A collision between two pieces of continental crust at a converging boundary produces a

mountain range

300

Oceanic crust near the mid-ocean ridge is (older or younger) than oceanic crust farther away from the ridge.

younger

300

If subduction occurs faster than oceanic crust can be created, an ocean will  

shrink

400

Volcanoes that form along a mid-ocean ridge occur at a(n) _______________ plate boundary.

diverging

400

The collision of two oceanic plates will form a deep ocean ________________.

trench

400

In sea-floor spreading, Where does molten material rise from the mantle and erupt?

along mid ocean ridges

400

When continental plates pull apart at a divergent boundary on land, a(n) ____________________ forms.

rift valley