The two forms of electromagnetic radiation that penetrate the atmosphere best are
A) X-rays and gamma rays.
B) ultraviolet and visible light.
C) visible and infrared light.
D) visible and radio waves.
E) infrared and microwaves.
D
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The four general categories of "energy resources" from which we can obtain useful energy services are: fossil, nuclear, renewable [i.e., alternative], and
A) hydroelectric. B) breeder reactors. C) biomass. D) chemical. E) energy efficiency.
Which of the following characteristics describes silicate minerals?
-Silicate minerals contain only silicon. -Silicate minerals make up 8 percent of Earth's crust. -Silicate minerals contain calcite and dolomite. -Silicate minerals contain halite and gypsum. -Silicate minerals contain silicon and oxygen.
An aluminum kettle (mass = 100 g) of pure water (mass = 60 g) is at room temperature (20°C). The kettle and its contents are placed on a 1000-Watt electric burner and heated to boiling
Assuming that all the heat from the burner heats the kettle and its contents and that a negligible amount of water evaporates before boiling begins, calculate the amount of time required to bring the water to a boil. A) 3.5 min B) 8.1 min C) 4.9 min D) 7.3 min E) 4.0 min
A hypothesis that has been repeatedly and rigorously tested and supported is known as a:
a. model b. testable prediction c. scientific method d. scientific theory e. result