Approximately what percent of geologic time is represented by the Precambrian? Which period within the Phanerozoic eon represents the longest interval of time? How long is it?
What will be an ideal response?
3958 out of 4500 million years which is approximately 3958/4500 or 88%; Cretaceous Period 145 -65 = 80 million years.
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The main feature distinguishing a hurricane from an ordinary tropical storm is that ____
A) hurricanes are larger B) tropical storms are more than 500 miles from the U.S. mainland C) winds speeds are greater in a hurricane D) hurricanes have a clearly defined eye on satellite photographs
A ________ can be defined as the likelihood of a particular factor impairing health or causing deaths
A) hazard B) control point C) disaster D) risk E) toxic
Do connections between habitat patches actually increase their diversity? Evidence from current field research involving plants is determining that ________
A) yes, corridors connecting habitat patches do increase species diversity B) only if adequate fertilizers and pesticides are applied to the habitats C) no, corridors connecting habitat patches actually decrease diversity D) only if migrating animals and birds carry seeds between patches E) no, corridors connecting habitat patches have yet to make a difference
At a pressure equivalent to a depth of 670 km the mineral olivine collapses to form ________.
A. perovskite B. calcite C. zircon D. quartz E. mica