Why must geologists understand the magnitude of geologic time?
a. The magnitude of geologic time spans billions of years and thus differs greatly from the magnitude of time people deal with on an everyday basis (e.g., hours, weeks).
b. Most fossils are found in the very oldest rocks on Earth, dating back 4600 years ago.
c. Most fossils are found in the very oldest rocks on Earth, dating back 4600 million years ago.
d. Geologic time deals mostly in 1000-year increments.
e. The magnitude of geologic time spans thousands of years and thus differs greatly from the magnitude of time people deal with on an everyday basis (e.g., hours, weeks).
a. The magnitude of geologic time spans billions of years and thus differs greatly from the magnitude of time people deal with on an everyday basis (e.g., hours, weeks).
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Earth curves a downward distance of 5 m for each 8000-m tangent. At the end of an 8000-km tangent on the Moon the drop would be
A. more than 5 m. B. also 5 m. C. less than 5 m. D. insufficient information for an estimate
The Appalachians formed as a result of the
A) Laramide orogeny. B) Alleghany orogeny. C) Cordilleran orogeny. D) Alpine orogeny.
The biosphere is best defined as ________
A) all living and nonliving parts, including the flow of energy and matter B) all Earth's organisms and the nonliving environment with which they interact C) all Earth's organisms and their physical and aquatic environment where energy and matter are cycled D) a grouping of plants and animals that interact with one another E) a regional grouping of plants, animals, and abiotic factors
The ocean became salty as water picked up chlorine from volcanic gases and sodium and magnesium from weathering of minerals at the Earth's surface.
Answer the following statement true (T) or false (F)