Earth Science

Which layer of the Earth is the most dense?

• crust

• mantle

• inner core

• outer core

Answer explanation

The inner core is the most dense layer of the Earth due to its high iron and nickel content, making it solid and compact.

Which layer of the Earth is responsible for Earth's magnetic field?

• outer core

• inner core

• mantle

• crust

Answer explanation

The outer core is responsible for Earth's magnetic field due to the movement of molten iron and nickel creating a dynamo effect.

The soft layer of the mantle on which the tectonic plates move

• Asthenosphere

• Outer Core

• Mantle

• Mesosphere

Answer explanation

The soft layer of the mantle on which the tectonic plates move is called the Asthenosphere.

Tags

NGSS.MS-ESS2-1

What is the thinnest layer of the earth’s composition?

• mantle

• inner core

• crust

• outer core

Answer explanation

The crust is the thinnest layer of the earth's composition, located on the outermost part of the planet's surface.

The thickest layer of the earth is the 

• crust

• mantle

• inner core

• outer core

Answer explanation

The thickest layer of the earth is the mantle, which lies between the crust and the outer core.

Temperature _____________________ as you go deeper into the earth.

• increases

• decreases

• goes up and down depending on the layer

• stays the same

Answer explanation

The temperature increases as you go deeper into the earth due to the geothermal gradient, where the Earth's internal heat increases with depth.

Pressure ______________________ as you go deeper into the Earth

• increases

• decreases 

• goes up or down depending on the layer

• stays the same

Answer explanation

Pressure increases as you go deeper into the Earth due to the weight of the overlying rock layers pushing down.

What are the two kinds of crust that the Earth has?

• Oceanic and Crustatious Crust

• Oceanic and Continental Crust

• Optic and Continental Crust

Answer explanation

The Earth has two kinds of crust: Oceanic and Continental Crust. These two types of crust differ in composition and thickness, with oceanic crust being denser and thinner than continental crust.

The plates of the crust move because...

• volcanoes erupt violently.

• of the weight of the oceans.

• of convection currents in the mantle.

• of the moon's gravity.

Answer explanation

The plates of the crust move because of convection currents in the mantle.

Tags

NGSS.MS-ESS2-3

The zone where one plate slides under another is called the

• Convergent zone

• Subduction zone

• Transform zone

• Mantle zone

Answer explanation

The correct answer is Subduction zone because it is the zone where one tectonic plate slides under another, leading to the formation of deep ocean trenches and volcanic arcs.