The hypoxia problem in the Gulf of Mexico is primarily caused by
A) local wind circulations along the coast.
B) very low thermocline levels in the Gulf of Mexico.
C) runoff of nutrient-rich fertilizers into the Mississippi River.
D) El Niño events.
C) runoff of nutrient-rich fertilizers into the Mississippi River.
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Which marine reptiles make long migrations to lay eggs on the very same beach they hatched from?
a. Sea turtles b. Crocodiles c. Lizards d. Sea snakes e. Iguanas
If the earth's axis were parallel with its orbital plane around the Sun
A) there would be no significant weather. B) the South Pole would always be in darkness. C) the North Pole would always be in darkness. D) there would be at least one day a year when every spot on Earth would receive 12 hours of daylight.
Why is ice less dense than water?
A. As water freezes, it forms cubic crystals made only of eight atoms. These atoms weigh less in ice than in water. B. Water molecules lose one of their hydrogen atoms when they form ice, making the solid form less dense than the liquid form. C. When water freezes, the molecules arrange into a crystal form in which they are farther apart than in liquid water. D. As a solid, ice is actually more dense than water, but will still float due to the high surface tension of water.
Which of the following is not “nature” or “natural” according to Aristotle?
a. A wooden bed b. Molten lava c. A breath of fresh air d. A violently destructive tornado