Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20). This fact relates to the organization of the periodic table in that strontium and calcium are both
A. in group 2 of the periodic table.
B. made of relatively large atoms.
C. soluble in water.
D. metals.
Answer: A
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The fossil record shows no significant change in terms of the diversity of organisms through
time. Indicate whether the statement is true or false.
The ultimate responsibility for public policy legislation controlling the waters of the United States is the
A) EPA. B) U.S. Congress. C) National Oceanic and Atmospheric Administration. D) United States Geological Services.
As oil becomes less available, secondary recovering methods will increase.
Answer the following statement true (T) or false (F)
Imagine that you were given a ship equipped with a device that could measure how deep the water is. You are asked to use this ship to find a subduction zone. What would you look for as you sailed around the world's oceans?
A) an oceanic ridge B) a mountain range C) a continental rift D) a deep-ocean trench