Plate Tectonics with HR and Galaxies

Front

Name the boundary

Back

convergent boundary

Answer explanation

A convergent boundary occurs where two tectonic plates collide, often leading to mountain formation or subduction. This is distinct from divergent and transform boundaries, making 'convergent boundary' the correct choice.

Front

Name the boundary

Back

transform boundary

Answer explanation

A transform boundary is where two tectonic plates slide past each other horizontally. This movement can cause earthquakes, making it distinct from convergent and divergent boundaries, which involve plate collision and separation, respectively.

Front

Name the boundary

Back

divergent boundary

Answer explanation

A divergent boundary occurs where tectonic plates move apart, allowing magma to rise and create new crust. This is distinct from convergent and transform boundaries, making 'divergent boundary' the correct choice.

Front

A subduction zone is formed...

Back

when one tectonic plate sinks below another

Answer explanation

A subduction zone is formed when one tectonic plate sinks below another, typically at convergent boundaries. This process is crucial for understanding tectonic activity and geological features like trenches and volcanic arcs.

Front

Plate movement is caused by ______________.

Back

convection currents in the mantle

Answer explanation

Plate movement is primarily caused by convection currents in the mantle, which are driven by heat from the Earth's core. This movement of molten rock creates the forces that push tectonic plates apart or together.

Front

What are mid-ocean ridges?

Back

A chain of underwater mountains

Answer explanation

Mid-ocean ridges are a chain of underwater mountains formed by tectonic plate movements and volcanic activity. They are not waterfalls, volcanos, or just rocks, making "a chain of underwater mountains" the correct choice.

Front

What does the theory of continental drift state?

Back

The continents were once joined in a super-continent and have moved over time

Answer explanation

The theory of continental drift states that the continents were once joined in a super-continent called Pangaea and have since moved apart over geological time, explaining the current positions of continents.

Front

Who is the person credited with developing the theory of continental drift?

Back

Alfred Wegener

Answer explanation

Alfred Wegener is credited with developing the theory of continental drift, proposing that continents were once joined and have since drifted apart. His ideas laid the groundwork for modern plate tectonics.

Front

Which of the following occurs because of convection currents? Tectonic plates on the crust move. The mantle increases in size. Pressure in the crust increases. Pressure in the crust decreases.

Back

Tectonic plates on the crust move.

Answer explanation

Convection currents in the mantle create movement in the Earth's crust, causing tectonic plates to shift. This movement is responsible for various geological phenomena, making 'Tectonic plates on the crust move' the correct answer.

Front

Where does the heat come from that drives this convection current in the mantle?

Back

the core

Answer explanation

The heat that drives convection currents in the mantle comes from the core. The core generates heat through radioactive decay and residual heat from Earth's formation, causing the mantle to move.