Which of the following general statements about Earth's atmosphere is not true?
A) The oxygen in our atmosphere was released by living organisms.
B) Without the relatively rare gas called ozone, Earth's surface would be bathed in dangerous ultraviolet light from the Sun.
C) The nitrogen and oxygen in Earth's atmosphere keep the surface pleasantly warm.
D) Gas high in the atmosphere absorbs dangerous X-rays from the Sun.
C
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What do we mean by the frost line when we discuss the formation of planets in the solar nebula?
A) It is another way of stating the temperature at which water freezes into ice. B) It marks the special distance from the Sun at which hydrogen compounds become abundant; closer to the Sun, there are no hydrogen compounds. C) It is a circle at a particular distance from the Sun, beyond which the temperature was low enough for ices to condense. D) It is the altitude in a planet's atmosphere at which snow can form.
What causes the release of oxygen into Earth’s atmosphere?
A. vaporization B. outgassing C. photosynthesis
What is the period (in hours) of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg, its radius is 3.40 × 106 m, and G = 6.67 × 10-11 N • m2/kg2
A) 1.75 h B) 1.25 h C) 1.15 h D) 1.00 h E) 1.45 h
A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?
What will be an ideal response?