A


 AIR
the mixture of gases in the atmosphere

 ATMOSPHERE
the mixture of gases surrounding the earth
 
B

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