Prominences and solar flares present dangers to astronauts primarily because ________
A) they can overheat the spacecraft.
B) they do not pose a danger to astronauts.
C) they disrupt communications on earth
D) they pose a radiation danger from X-rays and gamma rays, but primarily from high-energy particle emissions.
A
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Energy transferred by electromagnetic waves is called ____
A) magnetism B) convection C) conduction D) radiation
The federal law that first banned the dumping or discharge of wastes into any body of navigable water in the United States was the
A. Water Quality Improvement Act of 1970. B. Refuse Act of 1899. C. Federal Water Pollution Control Act of 1956. D. National Environmental Policy Act of 1969.
Mike stands at the edge of a cliff and throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
A. The one thrown downward B. The one thrown upward C. neither, both hit with the same speed D. need more information
How many electrons are transferred from iron atoms to oxygen atoms in the formation of two molecules of iron hydroxide, Fe(OH)2?
A. 4 electrons B. 16 electrons C. 8 electrons D. 12 electrons