test

What is seafloor spreading?

• a) The process of continents colliding
• b) The formation of mountains on land
• c) The creation of new oceanic crust at mid-ocean ridges
• d) The sinking of tectonic plates into the mantle

What did Wegener's hypothesis of continental drift propose?

• a) Continents are stationary and never moved.
• b) Continents were once joined together in a supercontinent called Pangaea.
• c) Earth's crust is made only of oceanic crust.
• d) Mountains formed due to volcanic activity.

What evidence supported Wegener's hypothesis of continental drift?

• a) Similar fossils on different continents and matching coastlines.
• b) The absence of earthquakes around the world.
• c) The changing color of the oceans.
• d) The discovery of new islands in the Pacific Ocean.

What causes the movement of tectonic plates?

• a) Air currents in the atmosphere
• b) Animal migration
• c) Convection currents in the mantle
• d) Changes in Earth's magnetic field

What is a mid-ocean ridge?

• a) A long underwater mountain range formed by volcanic activity
• b) A high mountain on land
• c) A large river in the ocean
• d) A flat desert area under the sea

What is the lithosphere made of?

• a) Solid and rigid outer mantle and liquid core
• b) Ocean water and sediment
• c) Earth's atmosphere and clouds
• d) Crust and rigid upper mantle

What causes earthquakes and volcanic activity?

• a) The movement of tectonic plates
• b) The rotation of the Earth
• c) The distance from the equator
• d) The moon's gravitational pull

How does seafloor spreading contribute to the movement of continents?

• a) By pushing the continents apart
• b) By pulling the continents together
• c) By creating mountains
• d) By causing earthquakes

What are seismic waves?

• a) Waves in the ocean
• b) Vibrations resulting from earthquakes
• c) Sound waves from animals
• d) Light waves from the sun

How do scientists study Earth's interior using seismic waves?

• a) By sending rockets into space
• b) By analyzing the patterns of ocean currents
• c) By studying rocks on the surface
• d) By observing the behavior of earthquake vibrations