The Atmosphere let light gases escape Earth's gravity!
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Answer:
the introduction of light-rail and the use of carpool lanes
Answer: Cloud at medium altitudes are:
A: They are made of ice crystals.
Explanation: Mid level cloud forms ice crystals when the temperature is cold.
All countries need or choose to import at least some goods and services for the following reasons: goods or services that satisfy domestic needs or wants can be produced more inexpensively or efficiently by other countries , and therefor sold at lower prices.