Why is it difficult to estimate how long natural resources like copper, oil, and coal will last? What will be an ideal response?
It is difficult to estimate because estimates depend on many variables.
1. It is hard to determine how much of a resource is potentially available.
2. Estimates are typically based on current rates of production and consumption, both of
which fluctuate.
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Solar system planets are classified as either ____________________ or ____________________ planets based upon
their chemical and physical properties. Fill in the blank(s) with the appropriate word(s).
The swim bladder of a fish ________.
A. is filled with oxygen B. allows it to move rapidly between depths C. keeps the fish neutrally buoyant D. All of these are correct. E. None of these is correct.
Changes in day length, the Sun's altitude above the horizon, and the Sun's declination over the course of the year
A) are factors that follow an irregular, random cycle. B) are phenomena that occur only at the equator. C) have little overall effect or importance in physical geography. D) are responsible for the seasons. E) produce Earth's rotation.
Demographic transition theory better explains changes in non-core countries than changes in core countries
Indicate whether this statement is true or false.