Midterm Review 24 - 25

Front

What is radioactive decay and how does it affect motion within Earth?

Back

Radioactive decay is a process that releases heat, causing the density of molten rock to decrease as it heats up. This results in the rock being pushed upward by denser material.

Tags

NGSS.MS-ESS2-1

Front

What differences in properties of Earth’s crust and mantle are responsible for tectonic activity?

Back

The differences in temperature and viscosity between the crust and mantle are responsible for tectonic activity.

Front

What is the primary composition of Earth’s mantle?

Back

Earth’s mantle is primarily composed of silicate and magnesium oxide rocks.

Front

What causes the differentiation between the mantle and outer core?

Back

The differentiation is caused by differences in density between the mantle and the liquid iron and nickel outer core.

Tags

NGSS.HS-ESS2-3

Front

What type of fossil is best for determining the age of rock layers?

Back

Index fossils are the best type of fossils to use for determining the age of rock layers.

Tags

NGSS.MS-ESS1-4

Front

How can the radioactive isotope content of a rock be used?

Back

The radioactive isotope content can be used to determine the age of the rock.

Front

What is the role of density in Earth's internal motion?

Back

Density differences in molten rock lead to convection currents, driving motion within Earth.

Front

What is the significance of index fossils in geology?

Back

Index fossils help geologists determine the relative ages of rock layers and correlate them across different locations.

Tags

NGSS.MS-ESS1-4

Front

How does temperature affect the viscosity of Earth's mantle?

Back

Higher temperatures decrease the viscosity of the mantle, allowing it to flow more easily.

Tags

NGSS.MS-PS1-4

Front

What is the difference between the crust and mantle in terms of state?

Back

The crust is solid, while the mantle, although solid, behaves like a viscous fluid over geological timescales.