The seasons are primarily due to
A) the distance of Earth from the Sun.
B) the wavelength of solar radiation.
C) the tilt of Earth's axis.
D) variations in greenhouse gas levels.
C
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Which of the following is not a step-growth polymer?
A) Lexan B) nylon-66 C) polystyrene D) poly(ethylene terephthalate)
Discuss the origin of Earth's oceans and how is it related to the origin of our atmosphere
What will be an ideal response?
Desert soils
A. accumulate more litter than other soils. B. have a thick B horizon. C. have poorly developed horizons. D. None of the statements is correct.
How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?
A. An age on the dike would not help us because it is an igneous rock. B. The upper unit would be older than an age determined on pebbles of the dike in that unit. C. The dike is younger than the lower unit but older than the upper unit. D. The lower unit would be younger than an age on the crosscutting dike.