We have not yet established the impact of solar variability on the Earth's climate system because:
A) satellites have not yet been around long enough to provide a data set of adequate length.
B) most scientists now agree that solar output is constant and does not vary.
C) it is not a legitimate enough theory to gain much attention from the scientific community.
D) we have no way of measuring solar variability directly.
A
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From which blood vessels are materials exchanged between blood and body tissues?
A) arteries B) arterioles C) capillaries D) veins
Why did Congress require the Environmental Protection Agency to establish minimum drinking water standards?
A) Long-term exposure to small amounts of chemicals was proven to be hazardous. B) Levels of contaminants in municipal drinking water systems rose to toxic levels. C) The long-term effects of small amounts of chemical contamination were unknown. D) Laboratory detection limits of common contaminants became much more sensitive.
The summer solstice in the northern hemisphere is on or about June 21. Where is the Sun relative to the Earth on this date?
a) The Sun is directly overhead along the equator. b) The Sun is directly overhead along the Tropic of Capricorn. c) The Sun reaches its most northerly point in the sky directly over the Tropic of Cancer. d) The Sun reaches its most southerly point in the sky directly over the Tropic of Capricorn.
Liquid hazardous wastes are commonly injected into deep, saline aquifers for disposal.
Answer the following statement true (T) or false (F)