Which portion of the lightning process is the most visible?
A) charge separation
B) stepped leader
C) return stroke
D) dart leader
Answer: C
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Much of Earth's water supply originated from
A) asteroids. B) icy comets. C) gases expelled from the Sun; i.e., solar wind. D) photosynthesis.
A dissolved oxygen minimum layer occurs in the ________ zone
A) abyssopelagic B) bathypelagic C) epipelagic D) mesopelagic E) nektopelagic
Only about 2.5% of all the water on our planet is fresh water, and ________
A) over half of this is in wetlands near coastlines and is becoming contaminated with saltwater B) over half of this is extremely hard water and is nearly unusable for drinking or agriculture C) most of this is far from where humans live D) most of this is in large, freshwater lakes E) most of this is in underground aquifers
Which of the following is essential in order for GPS to function?
A) Highly accurate clocks B) A nearby base station on Earth's surface C) A small, radar unit D) A GIS unit in a receiver E) Locations on land instead of the ocean