Most coral reefs are located in shallow water because below this depth, ________
A) sunlight levels are too low to sustain the photosynthetic algae living within the coral exoskeleton
B) there is not enough oxygen
C) water currents are too fast for coral to colonize
D) water temperatures are too cold for coral to grow
A
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Ordinary rain has a pH of about 5.5 to 6 from the carbon dioxide in the atmosphere and from natural sources of acidic sulfur gases.
Answer the following statement true (T) or false (F)
Trees that have taken on a low, twisted form to minimize their wind exposure in the harsh conditions near the limit of tree growth are referred to as ____
a. krummholz b. bergmann c. slope aspect d. epiphytes e. pioneer communities
At 10°C, which is more concentrated—a saturated solution of sodium nitrate, NaNO3, or a saturated solution of sodium chloride? (See figure shown above )
A) At 20°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl. B) At 10°C a saturated solution of sodium chloride, NaCl, is more concentrated than a saturated solution of sodium nitrate, NaNO3 C) At 10°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl. D) At 25°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl.
Contour lines cannot intersect one another.
Answer the following statement true (T) or false (F)