Why Continents Are High

The video explains the crucial role of water in Earth's geology, particularly in the formation of continental crust. It highlights how granite, a lightweight igneous rock, forms from magma due to tectonic activity beneath ocean trenches. This process involves water lowering the melting temperature of rocks, leading to the creation of low-density magma that forms granite mountains. Over time, these granite formations contribute to the assembly of continents, illustrating the dynamic nature of Earth's surface.

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

• Granite

• Basalt

• Sandstone

• Limestone

How does water influence the formation of granite beneath the ocean?

• It lowers the melting temperature of the rock.

• It raises the melting temperature of the rock.

• It prevents the formation of magma.

• It increases the density of the surrounding rock.

Which geological feature is associated with the creation of new continental crust?

• Volcanic islands

• Deep ocean trenches

• Desert plateaus

• Mid-ocean ridges

What happens to the dense sea floor when island chains collide with larger continents?

• It floats on the ocean surface.

• It becomes part of the continental crust.

• It evaporates into the atmosphere.

• It sinks into the planet.

How are the continents we live on today primarily formed?

• Through the deposition of sediments

• By the erosion of mountains

• By the accumulation of granite piles

• Through volcanic eruptions