Earth Systems E.2.1 6th Grade

Which layer of the Earth is located directly above the inner core?

• A. oceanic crust

• B. Atmosphere

• C. Outer Core

• D. Mantle

How does the inner core compare in density to the other layers of Earth?

• A. The inner core is the least dense of all the layers of Earth.

• B. The inner core is the densest of all the layers of Earth.

• C. The inner core and outer core have the same density.

• D. The inner core’s density is unknown.

Which is the most likely reason Earth is made of distinct separate layers?

• A. Volcanic lava inside Earth made the layers over time.

• B. Hot rocks sank to the center of Earth as it formed.

• C. Layers were made based on the density of rocks as Earth formed.

• D. Asteroids colliding with Earth formed the different layers.

These two layers work together to create an invisible magnetic field around Earth. One layer is liquid and the other layer is solid. Both are made of iron and nickel. Which two layers are being described?

• A. asthenosphere, lower mantle

• B. outer core, inner core

• C. crust, asthenosphere

• D. crust, lithosphere

Which term best identifies the thick, hot, convective layer of Earth?

• A. crust

• B. mantle

• C. inner core

• D. outer core

What would one notice about Earth’s continental plates if observing those

over a long period of time?

• A. They do not move.

• B. They are fast-moving.

• C. They are slow-moving.

• D. They combine into larger plates.

Which data have been most useful to scientists for defining properties of Earth’s layers?

• A. sound waves

• B. seismic waves

• C. satellite images

• D. sea surface temperatures

Which most likely explains why Earth’s inner core is solid?

• A. It is composed of rock that is not hot enough to melt.

• B. It is less dense and thick than the surrounding layers.

• C. It is under extreme pressure from surrounding layers.

• D. It is mostly diamond and other carbon-based materials.

Convection currents are found in which layer of Earth?

• A. inner core

• B. outer core

• C. mantle

• D. crust

Which statement explains the composition of Earth’s core?

• A. Both the inner and outer core are liquid.

• B. Both the inner core and outer core are solid.

• C. The liquid inner core is surrounded by a solid outer core.

• D. The solid inner core is surrounded by a liquid outer core.