Question: The diagram shows the movement of air as a result of convection currents.

At which point is the air at its highest density?

W

X

Y

Z

Answer: NOT W

Question: The law of conservation of energy states that energy cannot be or destroyed.

Answer: created

Question: Convection occurs when thermal energy is transferred by the movement of

Answer: fluids

Question: Which condition must exist in order for conduction to occur between two substances?

The molecules of the substances must be touching.

Both substances must be the same temperature.

At least one substance must be a liquid.

Most of the molecules must be slow moving.

Answer: The molecules of the substances must be touching.

Question: Which is an example of radiation?

An ice pack is placed on a knee, and the knee cools down.

A rock is warmed by an ultraviolet heat lamp.

Hot coffee in a mug causes the mug to warm up.

Cold salt water sinks to the bottom of the ocean.

Answer: NOT Hot coffee in a mug causes the mug to warm up.

Question: Thermal energy from the Sun travels to Earth by

conduction.

charged molecules.

electromagnetic waves.

convection currents.

Answer: electromagnetic waves.

Question:

Answer: They travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space.

Question: The diagram shows an example of convection.

Which label belongs on the arrow?

Warmer water sinks

Warmer water rises

Cooler water sinks

Cooler water rises

Answer: Cooler water sinks

Question:

Answer: NOT Thermal energy is being transferred from the person’s hands to the flames.

Question: The diagram shows the movement of magma due to convection currents.

Based on the diagram, which part of Earth is the coolest?

the crust

the mantle

the outer core

the inner core

Answer: the crust