Which of the following is the second most abundant positively charged component of seawater?
A) Calcium
B) Chloride
C) Magnesium
D) Sodium
E) Sulfate
C
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Which of the following can cause a seiche?
A. convection over a large land mass B. very strong winds C. high mountains interfering with a westerly wind flow D. wind shear at very high altitudes
Radioactive elements are found in materials all around us, even our bodies.
Answer the following statement true (T) or false (F)
The atmosphere is highly ________ with respect to solar radiation
A) reflective B) conductive C) transparent D) absorptive
The half-life of the carbon 14 isotope is 5730 years. If there were 4 billion atoms of C-14 in a particular organism at the time it died, how many atoms of C-14 would there be in the remains of that organism 11,460 years after it died?
A. 4 billion B. 2 billion C. 1 billion D. 8 billion E. 3 billion