We can measure stellar parallax for most stars in our galaxy
Indicate whether the statement is true or false
FALSE
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Measurements of carbon dioxide concentrations in our atmosphere over the past 800,000 years show
A) an indirect correlation with global surface temperatures B) a direct correlation with global surface temperatures, only over the past century C) no correlation with global surface temperatures D) a direct correlation with global surface temperatures
An underwater scuba diver sees the Sun at an apparent angle of 45.0° from the vertical. How far is the sun above the horizon? (nwater = 1.333)
a. 19.5° c. 48.2° b. 68.0° d. 41.8°
A brick is resting on a rough incline as shown in the figure. The friction force acting on the brick, along the incline, is
A) zero. B) equal to the weight of the brick. C) greater than the weight of the brick. D) less than the weight of the brick.
Which of the following is considered by biologists to be a likely place where life first arose on Earth?
A) on meteorites that landed on Earth B) on land surfaces that got moderately heavy rainfall C) in hot water near undersea volcanoes D) deep underground