Evaporites in the rock record commonly indicate a period of arid climate. Indicate whether the statement is true or false
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Which of the following statements describes a cold front?
A. It marks the position of a trough of high pressure. B. It has warm air behind it. C. It marks a zone of shifting winds. D. It is coloured purple on a weather map.
Hail:
A) requires very strong downdrafts. B) most frequently occurs in sizes greater than two centimeters in diameter. C) can provide the nucleus for graupel formation. D) usually forms in cumuliform clouds.
What group includes infectious germs, and purifies water by breaking down wastes, decomposes organic wastes into nutrients, and provides much of the world's oxygen?
A. carnivores B. autotrophs C. abiotics D. microbes E. herbivores
A(n) ____ is a test involving manipulations made on conditions of a particular observation
a. hypothesis b. experiment c. theory d. scientific method