On a weather map, a line with blue triangles on one side and red semicircles on the other represents:
A) a cold front. B) a warm front. C) an occluded front. D) a stationary front.
D
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Why does a potassium-argon dating time scale reset during heating?
A) Expansion of the crystal structure may permit the loosely caged argon atoms to escape. B) Reduction of the crystal structure may permit the loosely caged argon atoms to escape. C) It gets so hot that it throws off the time scale. D) This does not happen.
What powers the hydrologic cycle? What will be an ideal response?
Permafrost requires soil, sediment, or rock temperatures to remain below freezing for at least 2 years
Indicate whether the statement is true or false
What was the major reason why the death rate dropped in the Stage 2 of the Demographic Transition?
A) vaccinations B) domestication of plants and animals C) public health measures, such as sewer systems and clean drinking water D) advances in surgical procedures E) Warfare declined.