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Ocean temperatures near the poles are typically ____ than near the equator, but currents can change this.
After most fresh water starts as rain or snow, then what does it become:
groundwater, rivers, lakes, or ice
Describe some characteristics of groundwater
keeps sinking until it reaches an aquifer
water table changes during the year
well water comes from aquifers
What are the steps for treating water?
water is pumped to treatment plant
Chemicals are added to attract dirt
Water passes through a filter
Helpful chemicals are added
Water is pumped to a water tower
Water flows through a pump to the community
Steps for hail
strong winds blow raindrops upward into the freezing air of a cloud
a small piece of ice is created
the ice continues to be blown upward until it is too heavy for the wind
Falls to the ground
Describe Cirrus clouds.
High altitude clouds form more than 6,000 m above the ground. Cirrus clouds are high altitude clouds that are thin, wispy, and white.
Describe Thunderhead clouds.
Clouds that grow vertically have rising air inside them. The bases of these clouds may be as low as 1,000m above the ground. The rising air may push the tops of these clouds higher than 12,000 m up. Vertical clouds are sometimes called thunderheads because they often cause thunderstorms.
Describe Altocumulus clouds.
The bases of mid-altitude clouds are between 2,000m and 7,000m above the ground. Altocumulus clouds are mid-altitude clouds that look like small, puffy balls. The bottoms of the clouds can look dark because sunlight may not reach them. The sides of the clouds are white because sunlight is reflecting off them.
Describe Stratus clouds.
Low altitude clouds are often seen less than 2,000m above the ground. Stratus clouds are low altitude clouds that cover the whole sky. They look dark because little sunlight gets through the layer of clouds.
Fog is a cloud at ground level. It can form in several ways. One kind of fog can form on clear, cool nights with no wind. Air near the ground cools. If the air cools enough, water vapor condenses into tiny droplets and forms a cloud at or near the ground. As more droplets form and get larger, the fog appears thicker.
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