Continental Drift + Seafloor Spreading Theories - AL COS #6

What are the two types of crust?

• continental and oceanic
• ocean and basin
• lower and upper
• thick and thin

Younger sea floor crust is located...

• farther from the mid-ocean ridges

• at the mid ocean ridges

• near the continents

The OLDEST rocks on the seafloor are located?

• Closest to the mid-ocean ridge

• Farthest from the mid-ocean ridge

Seafloor spreading occurs because ____.

• new material is being added to the asthenosphere

• earthquakes break apart the ocean floor

• sediments accumulate at the area of spreading

• molten material beneath Earth's crust rises to the surface

What is formed at the subduction zone?

• mountain ranges

• deep-sea trenches

• oceanic ridge

• hills and valleys

Magnetic bands on the ocean floor are evidence that Earth’s magnetic field changes.

• TRUE

• FALSE

What are the three types of Evidence that supports Alfred Wegener's Theory?

• Fossils, Fish, and Land

• Sedimentary, Magma, and Climate

• Fossils, Land forms, and Climate

• Climate, Land forms, and Metamorphic rock

Glossopteris grew in warm, swampy areas, proving Antarctica used to have a ________________climate.

• warm and wet

• hot and dry

• cold and icy

• temperate

What does the theory of continental drift state?

• The continents were once joined in a super-continent and have moved over time
• Continents are stationary and do not move
• The Earth is broken into lithospheric plates that move due to convection currents
• none of the above

What is a theory?

• An idea based on hypothesis and problems observed using five senses

• A belief, policy, or procedure that is proposed and followed blindly without evidence to support itself

• A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.