The first telescopes, and most amateur telescopes, rely on the human eye to observe objects. The first improvement on this observation method used ________
A) photographic film B) polyspectral scanners
C) digital cameras D) projection systems
A
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A form of kinetic energy that travels in the form of waves as a result of changes in electrical and magnetic fields is
a. Wind b. electromagnetic radiation c. Waterfalls d. Electricity e. solar radiation
How much of Earth's surface is desert?
A) 40% B) 25% C) 45% D) 30% E) 35%
Why is it warmer in the northern hemisphere in July than it is in December?
a. Earth is closer to the sun in the summer than the winter. b. The sun’s rays shine more directly on the northern hemisphere in the summer than in the winter. c. There are more greenhouse gases, such as carbon dioxide, in the atmosphere in the summer than in the winter. d. The sun’s energy output is greater in the summer than it is in the winter. e. The size and shape of Earth’s elliptical orbit changes from nearly circular in the summer to highly elliptical in the winter.
What is the system of social distinction in Indian reinforced by language, region and occupation?
A) dharma B) jati C) adivasi D) dalit E) none of the above