ESRT Pages 1,10,14

Front

What is the temperature of the stiffer mantle at a depth of 2,000 kilometers?

Back

3,500ºC

Front

Which graph best represents the percent by volume of elements in Earth's hydrosphere?

Back

Graph A

Front

What is the approximate rate of Earth's revolution around the Sun?

Back

1° per day

Front

In which atmospheric layer does the greatest pressure occur?

Back

Troposphere

Front

Why does the oceanic crust sink beneath the continental crust at a subduction boundary?

Back

The oceanic crust has a greater density.

Front

Define the term 'subduction boundary'.

Back

A tectonic plate boundary where one plate moves under another, often leading to volcanic activity.

Front

What is the composition of the continental crust compared to the oceanic crust?

Back

The continental crust is generally less dense and more granitic, while the oceanic crust is denser and more basaltic.

Front

Explain the role of Earth's magnetic field in tectonic plate movement.

Back

Earth's magnetic field does not directly pull tectonic plates; instead, plate movement is driven by convection currents in the mantle.

Front

What is the primary reason for the formation of oceanic trenches?

Back

Oceanic trenches are formed at subduction zones where one tectonic plate is forced under another.

Front

What is the significance of the troposphere in Earth's atmosphere?

Back

The troposphere is the lowest layer of the atmosphere where weather occurs and where most of the atmosphere's mass is found.