Approximately 4.5 billion years ago, a Mars-sized object impacted the semi-molten Earth. Some of the debris from this impact coalesced to form the Moon.
a. true
b. false
a. true
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What are the advantages and disadvantages of the cap-and-trade approach?
What will be an ideal response?
Match the term with the correct description.?
A. ?chemicals or forms of radiation that cause or increase the frequency of DNA mutations B. ?chemicals, some types of radiation, and certain viruses that can cause or promote cancer C. ?chemicals that harm or cause birth defects in a fetus or embryo D. ?natural and synthetic chemicals that can harm the human nervous system E. ?certain synthetic chemicals that have shapes similar to those of natural hormones
The effect of surface friction extends to a height of about 500 m (1600 ft.) although it may vary with wind speed, season, time of day, and pressure patterns
Indicate whether the statement is true or false
If a septic system is to be used for sewage disposal,
A. the surrounding soil must be impermeable to contain the wastes. B. in normal operation, all potential pollutants will be decomposed. C. the soil should be unsaturated, containing sufficient air (oxygen) to permit aerobic breakdown of wastes. D. high population density is required for efficient operation.