A condition that causes a system to change dramatically is a ____
a. dynamic equilibrium
b. threshold
c. model
d. subsystem
e. natural hazard
b
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Indicate whether the statement is true or false
The primary problem associated with natural gas is transport of the gas to consumers.
Answer the following statement true (T) or false (F)
High-gradient bedrock channels generally have shallow, wide cross-sections
a. True b. False
Judge the following sentence according to the criteria given below: Different hemispheres on Earth are tilted more directly toward or away from the Sun during Earth's yearly orbit BECAUSE Earth revolves around the Sun in an elliptical orbit that
varies from a perfect circle. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.