HW#104 (Do with CW#122)

Why is the Earth considered a system?

• Earth is considered a system because energy and matter are transferred or exchanged throughout its four major spheres.

• Earth is considered a system because it makes sense that it would be due to Edgar Allan Poe's famous poems.

In a closed system, ______.

• Energy is transferred or exchanged with the system's surroundings.

• Energy is removed from the system's surroundings.

• Energy and matter are removed from the system's surroundings.

• Energy and matter are transferred or exchanged with the system's surroundings.

Identify the two main sources of energy in the Earth's system.

• Heat generated by the Earth's core (internal) and the energy provided by the sun (external).

• Fire, water, earth, and wind!

Fresh water makes up ______ of our planet's water supply.

• 3%

• 97%

• 2%

• 15%

What are the four main cycles that exist within the Earth system?

• The nitrogen cycle, the carbon cycle, the phosphorus cycle, and the water cycle.

• Moon cycle, Wash Cycle, Gentle Cycle, Unicycle.

The element nitrogen makes up the ______.

• Largest percent of our atmosphere

• Smallest percent of our geosphere

• Smallest percent of our atmosphere

• Largest percent of our geosphere

biosphere

• A ________ includes the part of the Earth that contains all living organisms.

• The ________ includes the solid, mostly rocky portion of the Earth. This portion extends from the Earth's core to its surface.

The _______ includes the solid, mostly rocky portion of the Earth. This portion extends from the Earth's core to its surface.

• geosphere

• biosphere

A _____ includes the water supply in the form of oceans and fresh water on our planet.

• hydrosphere

• atmosphere

 The ______ is the mixture of gases that surround our planet. The atmosphere is our planet's source for oxygen.

• atmosphere

• hydrosphere