Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction1
Answer:
Because of this region's relatively abundant access to water,
Explanation:
Named for its rich soils, the Fertile Crescent, often called the “cradle of civilization,” is found in the Middle East. Because of this region's relatively abundant access to water, the earliest civilizations were established in the Fertile Crescent, including the Sumerians.
Answer:Yes, because life is almost certainly going to use amino acids, and it needs nitrogen to build them. So that's a key requirement. OK, temperature, water, sunlight, nitrogen, and nothing that will kill off life.
Explanation:
An ecosystem is more complicated than a food chain because it doesn't only involve which organisms are predators, prey, or producers. It involves all of the possible interactions between the organisms with the biotic and abiotic factors within it.
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Answer:
What is the difference between relative and absolute age? Relative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils.
Explanation:
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