Earth Spheres & Systems Notes

The __________ radiates energy that reaches the surface of the Earth.

• sun

• moon

• stars

• clouds

Fill in the blank: The atmosphere is made of about 78% nitrogen, 21% oxygen, 0.9% argon, and small amounts of trace gases. There is also water vapor, dust, pollen, spores, and many other tiny things floating in the ____.

• atmosphere

• ocean

• soil

• space

Water __________s into clouds and when it gets too heavy it falls as precipitation like rain.

• evaporates

• condenses

• freezes

• sublimates

The Earth has a __________, metal __________ at its center which radiates energy up to the surface.

• core

• crust

• mantle

• shell

Rain and flowing water break down boulders and mountains into pebbles and hills over long periods of time.

• weathering

• erosion

• deposition

• sedimentation

The __________ is an amazing system with different parts that change the Earth’s __________ over time.

• ecosystem, climate

• ecosystem, surface

• biosphere, climate

• biosphere, surface

Water moves around the Earth in the __________ which is driven by energy from the sun and __________.

• water cycle

• carbon cycle

• rock cycle

• nitrogen cycle

What percentage of the Earth's water is saltwater?

• About 98% of the water on Earth is saltwater.

• About 50% of the water on Earth is saltwater.

• About 70% of the water on Earth is saltwater.

• About 30% of the water on Earth is saltwater.

"Geo" in geosphere means ____.

• air, vapor
• rock, earth
• water
• life

This "sphere" has Earth's water

• Geosphere

• Hydrosphere

• Atmosphere

• Biosphere