In searching for life in the solar system, which basic requirement of life is the most fundamental and the one we always look for?
A) the presence of organic matter
B) the presence of an energy source
C) the presence of a liquid medium, most likely water
D) the presence of oxygen
C
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The atmosphere of Mars is composed of mostly carbon dioxide along with some nitrogen
Indicate whether the statement is true or false
The last major dinosaurs were wiped out as a consequence of a major impact with the Earth about 65 million years ago. All but one of the following statements would be regarded as evidence for this claim
A) The fossil record shows a mass extinction event 65 million years ago, where only 25% of the species survived. B) At least 150 craters from past impacts have been identified, including one of the right age and size in Mexico. C) A layer of iridium in 65-million year old sediments in the Earth's crust D) Multiple historical accounts describe a planetary-level flood and storm that wiped out most living things.
When the input piston of a hydraulic press is depressed 20 cm, the output piston is observed to move 1 cm. An input force of 1 N can raise no more than
A) 1 N. B) 10 N. C) 20 N. D) 21 N.
The change in the direction of a wave resulting from its encountering a small slit is known as
a. interference. b. diffraction. c. reflection. d. polarization.