The gibbous Moon is never visible in the daytime sky
a. True
b. False
Indicate whether the statement is true or false
False
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Geological evidence points to a history of extended ice ages in Earth's history. How did Earth recover from this snowball phase?
A) The increased ice coverage on Earth's surface absorbed more sunlight than water and rocks, thus gradually heating Earth until the ice melted. B) Life vanished, leading to an increase in CO2, and increased global warming, eventually melting the ice. C) Volcanoes continued to inject CO2 into Earth's atmosphere, increasing the greenhouse effect to the point where ice melted. D) Plate tectonics gradually subducted all the ice below Earth's surface. E) As the Sun aged, it grew brighter and increased Earth's temperature, melting the ice.
The volcanic activity of Enceladus has what effect outside the moon itself?
What will be an ideal response?
Igneous rock that formed on Earth's surface by solidification of lava is known as
a. extrusive rock. b. intrusive rock. c. metamorphic rock. d. silicate rock.
Which of the following statements about ozone (in Earth's stratosphere) is not true?
A) The presence of ozone was crucial to the origin of life. B) If the ozone layer is depleted, we can expect the rate of mutations in land-based life-forms to increase significantly. C) Ozone absorbs ultraviolet light from the Sun. D) The human-made chemicals known as CFCs can cause a loss of ozone in the atmosphere.