A

AIR the mixture of gases in the atmosphere

ATMOSPHERE the mixture of gases surrounding the earth

C

CENTIGRADE metric  measurement of heat; using a temperature scale where water freezes at 0 degrees and boils at 100 degrees

COLD AIR air that is cool and dense, tends to be the closet to the ground

CONVECTION  the most important form of heat transfer within the atmosphere

D

E

ELEMENTS the building blocks of matter

EROSION wearing away of rocks and soil by wind and water

EVAPORATION the changing of liquid water into water vapor

F

FAHRENHEIT English measurement of temperature, water boils at 212 degrees and water freezes at 32 degrees above zero; zero is determined by taking an equal mass  of snow and salt	FLOW to move	FLUID a non-solid substance that flows any liquid or gas is a fluid ; all fluid take on the shape of the container in which they are in
FRESH WATER Water that is clean, and you can drink there is not salt in the water

G

GAS a substance that does not become a liquid or solid at ordinary temperatures, fills most balloons

H

HEAT a form of energy that is produced by movements of molecules, usually associated sunlight

HOT AIR air, whose molecules are moving fast

HYDROGEN a colorless, odorless, tasteless, gaseous element, the lightest substance known combining with oxygen to form water

I

J

K

L

LIQUID a substance like water or oil that flows freely but is not a gas

M

MOISTURE having wetness, for example dew drops on plants in the morning

N

O

OCEANS large bodies of salt water that contain many types of animals, people can not drink the water in them

OXYGEN a colorless odorless tasteless gas existing in air and combining with hydrogen from water

OCEAN WATER water in the ocean

P

PRECIPITATION forms of water vapor that are heavy enough to fall on the earth's surface, such as rain, snow, hail, and fog

Q

R

RAIN condensed moisture of the atmosphere falling in seperate drops

S

SALT  a substance needed to live, made of the elements sodium and chloride	SOLID keeping its shape, firm, not a liquid or gas, for example a rock	SUN a star in our solar system that helps heat the earth and keeps plants alive
SURFACE TENSION the tension of the surface film of the liquid, tending to minimize its surface area

T

TEMPERATURE the intensity of heat or cold in the body or room or country

THERMOMETER an instrument that measures heat

U

V

W

WATER CYCLE the continuous movement of water from the atmosphere to the earth and from the earth to the atmosphere	WATER a colorless, odorless, tasteless, liquid that is a compound of oxygen and hydrogen	WEATHER the conditions of the atmosphere at a certain place or time
WIND the horizontal movement of air relative to the earths surface

X

Y

Z