Crustal Composition and Oceanic Features in Earth Science

The video tutorial explains the differences between granite and basalt, highlighting their roles in continental and oceanic crusts. Granite forms the thicker continental crust, while basalt forms the denser, thinner oceanic crust. The video also covers plate tectonics, explaining how the movement of tectonic plates led to the separation of continents from Pangaea. The process of subduction, where denser oceanic crust sinks beneath continental crust, is also discussed, along with its role in volcanic activity.

What type of rock is commonly used for countertops and is a major component of the continental crust?

• Basalt

• Limestone

• Granite

• Sandstone

How thick is the continental crust on average?

• 25 miles

• 3 miles

• 18 miles

• 10 miles

What is the primary rock type that makes up the oceanic crust?

• Marble

• Basalt

• Slate

• Granite

Why is the oceanic crust thinner than the continental crust?

• It is constantly eroded by water

• It is composed of denser materials

• It is older and has worn down

• It is made of lighter materials

What geological process occurs when oceanic crust collides with continental crust?

• The continental crust subducts under the oceanic crust

• The oceanic crust floats above the continental crust

• Both crusts merge and form a mountain

• The oceanic crust subducts under the continental crust

What natural phenomenon is often a result of subduction?

• Volcanic eruptions

• Tsunamis

• Hurricanes

• Earthquakes

What was the name of the supercontinent that existed before the continents drifted apart?

• Gondwana

• Laurasia

• Pangaea

• Atlantis

What causes the movement of tectonic plates?

• Convective currents in the mantle

• Ocean currents

• Magnetic fields

• Wind currents

What type of rock is formed from the mantle and is denser due to its iron and magnesium content?

• Limestone

• Granite

• Quartz

• Basalt

What sound was humorously mistaken for ocean waves in the video?

• People talking

• Wind blowing

• Cars passing by

• Birds chirping