| A | B |
|---|
| AIR | A MIXTURE OF GASES INCLUDING NITROGEN, OXYGEN, CARBON DIOXIDE, AND WATER VAPOR |
| NITROGEN | THE MOST ABUNDANT MATTER IN AIR |
| OXYGEN | THE SECOND MOST ABUNDANT MATTER IN AIR |
| CARBON DIOXIDE AND WATER VAPOR | THE LEAST ABUNDANT MATTER IN AIR |
| ATMOSPHERE | THE BLANKET OF AIR THAT SURROUNDS THE EARTH |
| TROPOSPHERE | THE LOWEST LAYER OF THE ATMOSPHERE THAT HAS ENOUGH AIR TO SUPPORT LIFE |
| STRATOSPHERE | EXTENDS TO ABOUT 30 MILES ABOVE EARTH |
| MESOSPHERE | EXTENDS TO ABOUT 50 MILES ABOVE THE EARTH |
| THERMOSPHERE | EXTENDS TO ABOUT 420 MILES ABOVE THE EARTH |
| WEATHER | THE CONDITION OF THE ATMOSPHERE AT A CERTAIN PLACE AND TIME |
| GREENHOUSE EFFECT | THE PROCESS IN WHICH HEAT FROM EARTH IS TRAPPED BY THE ATMOSPHERE |
| WIND | THE MOVEMENT OF AIR |
| LAND BREEZES | COOLER AIR MOVES OUT TOWARD THE WATER AND TAKES THE PLACE OF RISING AIR. |
| SEA BREEZES | COOLER AIR OVER THE WATER MOVES TOWARD LAND AND TAKES THE PLACE OF WARMER AIR THAT HAS RISEN |
| BAROMETER | A DEVICE THAT MEASURES AIR PRESSURE |
| AIR PRESSURE | THE PUSH OF AIR AGAINST ITS SURROUNDINGS |
| HIGH PRESSURE AREAS | AREAS WHERE PRESSURE IS HIGHER THAN THE SURROUNDING AIR |
| LOW PRESSURE AREAS | AREA WHERE THE PRESSURE IS LOWER THAN THE SURROUNDING AIR |
| WIND VANE | A DEVICE THAT SHOWS WIND DIRECTION |
| ANEMOMETER | A DEVICE THAT MEASURES WIND SPEED |
| BEAUFORT SCALE | A SCALE THAT DIVIDES WIND SPEEDS INTO 12 DIFFERENT CATEGORIES |
| WATER CYCLE | THE MOVEMENT OF WATER INTO THE AIR AND BACK TO EARTH'S SURFACE |
| EVAPORATION | WHEN WATER CHANGES FROM A LIQUID TO A GAS |
| CONDENSATION | WHEN WATER CHANGES FROM A GAS TO A LIQUID |
| CLOUD | AN OBJECT THAT FORMS WHEN WATER VAPOR IN THE AIR CONDENSES |
| FOG | A CLOUD THAT TOUCHES THE EARTH'S SURFACE |
| PRECIPITATION | ANY FORM OF WATER THAT FALLS FROM THE AIR |
| RAIN GAUGE | A DEVICE TO MEASURE PRECIPITATION |
| HUMIDITY | THE AMOUNT OF WATER VAPOR IN THE AIR |
| RELATIVE HUMIDITY | THE AMOUNT OF WATER VAPOR THE AIR IS HOLDING COMPARED TO THE AMOUNT IT COULD HOLD AT THAT TEMPERATURE |
| WEATHER SATELLITES | DEVICES USED IN SPACE TO TAKE PICTURES OF CLOUDS AND COLLECT WEATHER INFORMATION |
| CUMULUS CLOUDS | PUFFY CLOUDS THAT FORM WHEN LARGE AREAS OF WARM, MOIST AIR RISE UPWARD FROM THE EARTH |
| STRATUS CLOUDS | FLAT, GREY BLANKETS THAT COVER THE SKY WHEN WARM, MOIST AIR RISES SLOWLY FROM THE EARTH |
| CIRRUS CLOUDS | WISPY CLOUDS THAT FORM WHEN THE AIR RISES HIGH ENOUGH FOR CRYSTALS TO FORM |
| WEATHER FORECASTER | SOMEONE WHO MAKES PREDICTIONS ABOUT THE WEATHER |
| AIR MASS | A BODY OF AIR THAT HAS THE SAME GENERAL TEMPERATURE AND AIR PRESSURE THROUGHOUT |
| FRONT | A PLACE WHERE TWO DIFFERENT TYPES OF AIR MASSES MEET |
| COLD FRONT | WHEN A COLD AIR MASS MOVES INTO A WARM AIR MASS |
| WARM FRONT | WHEN A WARM AIR MASS MOVES INTO A COLD AIR MASS |
| CLIMATE | AVERAGE WEATHER CONDITIONS OVER A LONG PERIOD OF TIME |
