The Structure of Water
What is the chemical formula for water?
H2O
Humans have changed Earth's surface so much, they can stop the global water cycle.
false. Humans change how water moves, but they cannot stop the global movement of water.
What are the 3 states of water?
Solid, liquid, and gas.
Most of Earth's water is in the form of _______ water.
salt
-In which step of the water cycle does water return to earth surface?
-Precipitation.
What atoms can be found in water?
Hydrogen and oxygen.
Water that cannot infiltrate the surface of the Earth will move downhill as __________.
runoff
In which state do the molecule move the slowest? And the fastest?
Slowest: solid Fastest: gas
Water that fills the cracks and spaces in underground soil and rock layers is called ______________.
Ground Water.
Why does water form on the outside of a cold glass?
Water particles in the form of gas in the air gather together when they cool off, and become liquid again.
As water heats up, its molecules ____________.
move around more, and speed up.
The movement of water down into the earth is called ______.
infiltration
The process by which a gas changes to a liquid is called _________.
Condensation.
Clouds are a major reservoir for water on Earth.
true
Water that falls to earth as rain, snow, hail or sleet is called _____________.
Precipitation.
Describe the molecules of water in solid form.
tightly packed together, and vibrating.
Gravity will always cause water to move _________.
downhill
What is the only substance on Earth that commonly exists as a solid, liquid AND gas?
Water.
What is one of Earth's largest sources of lake water, found here in the United States?
The Great Lakes
The process when the water is given off through the leaves as water vapor is called _____________.
Transpiration.
Describe the behavior of water molecules in gas form.
Moving fast and bouncing into each other; will spread out to fill and escape any container unless there is a tight lid.
Name the 2 main drivers of water movement.
heat and gravity
1. Water moves between the liquid and gaseous states by ___________and____________. 2. Water moves between the liquid and solid states by ___________and____________.
1. Evaporation and condensation. 2. Freezing and melting.
What state of matter is most of Earth's fresh water found?
Ice (solid)
What is the main way water moves out of an ocean reservoir?
evaporation, then falling as precipitation onto another part of Earth.