Why is Earth described as a system?

• It has many subway systems throughout the major cities.

• It is made up of several interacting parts.

• It's population consists of many different cultures that interact with each other.

• It interacts only with the Moon

What are Earth's subsystems? Select all that apply

• biosphere

• atmosphere

• chromosphere

• asthenosphere

A person's location can be described in many different ways depending on the _____________.

• system

• bird's eye view

• frame of reference

• location

What is NOT an example of Earth's subsystems?

• asthenosphere

• hydrosphere

• geosphere

• chromosphere

• biosphere

What causes day and night on Earth?

• Earth's revolution around the sun

• Earth's tilt on its axis

• Earth's rotation on its axis

• The Moon's gravitational pull on Earth

How much of Earth is in daylight at a time?

• 1/3 of Earth

• 1/2 of Earth

• entire Earth

• 3/4 of Earth

How much of Earth is in its shadow at a time?

• 1/3 of Earth

• 1/2 of Earth

• entire Earth

• 3/4 of Earth

Earth rotates straight on its axis.

• True

• False

Earth's axis is always tilted toward the _______.

• Sun

• Moon

• North Star

• Mars

Why is it hotter in the summer?

• Earth's axis points toward the Sun (direct light rays)

• Earth is closer to the Sun

• 1/2 of Earth is facing the Sun

• Sunlight reflects off the Moon