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Answer:
1)wind:air that is moving across the surface of the earth
2)As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
3)Air currents are concentrated areas of winds. They are mainly due to differences in pressure or temperature. They are divided into horizontal and vertical currents; both are present at mesoscalewhile horizontal ones dominate at synoptic scale. Air currents are not only found in the troposphere, but extend to the stratosphere and mesospher.
4)storm:very bad weather, with a lot of rain, strong winds, etc.
5)Features. A tornado is a swirling vortex or column of air with a hollow core. Thecirculating air often contains debris and dust and moves in an upward spiral at high speeds. The bottom of the tornado column makes contact with the ground, while thetop of the tornado can extend 5 or more miles into the sky.
Answer:
A good soil structure is important to allow air and water into the soil which are vital for healthy plant growth. It will improve drainage and reduce soil erosion caused by excess surface run-off. Without structure, soils will suffer from anaerobism, waterlogging and nutrient lock-up and, ultimately, plants will die!