As air moves from areas of high pressure to areas of low pressure, it creates THIS.
What is wind.
100
Most scientists agree that when Earth formed, it was a ball of molten rock. As Earth slowly cooled, its outer surface hardened. Erupting volcanoes emitted hot gases from Earth’s interior. These gases surrounded Earth, forming THIS.
What is it's atmosphere.
100
The cell at the highest northern latitudes is also THIS type of cell.
What is a convection cell.
100
THIS is a large body of circulating air with low pressure at its center and higher pressure outside of the system.
What is a low-pressure system.
100
A region’s climate depends on average temperature and THIS, as well as how these variables change throughout the year.
What is precipitation.
200
A cloud that forms near Earth’s surface is called THIS.
What is fog.
200
The atmosphere contains the oxygen, carbon dioxide, and THIS, which are necessary for life on Earth.
What is water.
200
THIS pollution is pollution that comes from an identifiable source.
What is point-source pollution.
200
Also known as electrical storms because of their lightning, THESE have warm temperatures, moisture, and rising air, which may be supplied by a low-pressure system.
What are thunderstorms.
200
Along coastlines, weather is more THIS throughout the year.
What is constant or similar.
300
THIS is the series of natural processes by which water continually moves among oceans, land, and the atmosphere.
What is the water cycle.
300
About 21 percent of Earth’s atmosphere is THIS element.
What is oxygen.
300
The Sun’s energy warms Earth. However, the same amount of energy does not reach all of Earth’s surface. The amount of energy an area gets depends largely on THIS.
What is the Sun's angle.
300
Forming over Siberia and the Arctic are THESE. They contain bitterly cold, dry air. During winter, it can bring temperatures down to −40°C.
What is an Arctic Air Mass.
300
Roads and THESE in cities have more concrete than surrounding rural areas. The concrete absorbs solar radiation, causing warmer temperatures than in the surrounding countryside.
What are buildings.
400
rain, sleet, snow, and hail are all forms of THIS.
What is precipitation.
400
Although microscopic in size, water droplets are visible when they form THESE.
What are clouds.
400
The contrast between high and low pressure and THIS creates distinct wind patterns, called prevailing winds.
What is the Coriolis Effect.
400
THIS diagram displays data from many different weather measurements for a particular location.
What is a station model.
400
In 1918 German scientist Wladimir Köppen (vlah DEE mihr • KAWP pehn) developed a system for classifying the world’s many climates. Köppen classified a region’s climate by studying its temperature, precipitation, and native THIS.
What is vegetation.
500
THIS instrument measures wind speed.
What is an anemometer.
500
THIS extends from about 15 km to about 50 km above Earth’s surface.
What is the stratosphere.
500
THESE influence weather as they move cold air from the poles toward the tropics and warm air from the tropics toward the poles.
What are jet streams.
500
Images taken from satellites orbit about THIS MANY kilometers above Earth provide information about weather conditions on Earth.
What is 35,000 kilometers.
500
In polar climates, the soil is frozen year-round—a condition called THIS.