Which of the following choices is NOT a major system of the Earth?

• Life

• Water

• Lithosphere

• Air

Which layer is the thickest

• inner core

• mantle

• crust

• outer core

What is the inner core made out of?

• lead and cadmium

• hydrogen and helium

• iron and nickel

The crust and the upper mantle make up the

• lithosphere

• asthenosphere

• mantle

• inner core

The layer of the ionosphere that reflects radio waves is called

• Kennelly-Heaviside layer

• Aurora

• Aurora Borealis

• Aurora Australis

Earths outer core is responsible for

• Earth's rotation

• gravity

• Earth's magnetic field

Convection currents are located in the

• Mantle

• Crust

• Core

Temperature __________ as you move towards the core

• increases

• decreases

The oceanic crust is

• large and light

• thin and dense

Scientists learn about Earth's layers by studying

• earthquakes

• volcanoes

• hurricanes

• the moon