What are radioactive isotopes, and why are they important to geologists? What will be an ideal response?
A radioactive isotope is one that undergoes spontaneous decay from one isotope of an element to
another isotope of that same element, or even change to other elements. Radioactive isotopes are
important for determining the absolute ages of rocks.
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A bird can sit harmlessly on a high-voltage wire because
A. current is inside, not outside, the wire. B. the net charge on a current-carrying wire is zero. C. the wire is insulated. D. no potential difference is across the birds feet.
The prime meridian and the 180th meridian are opposite halves of the same great circle
Indicate whether the statement is true or false.
Which of the following is an example of a hierarchical religion?
A) Hinduism B) Sikhism C) Jainism D) Catholicism E) Greek Orthodox
Pelagic clays contain lots of material that settles to the seafloor through the water column and are ________
A) less than 30% biogenous material B) more than 30% biogenous material C) more than 30% hydrogenous material D) less than 30% neritic material E) more than 30% neritic material