Evidence from proxies indicate eight major oscillations in global temperatures over the past 800,000 years, most likely the result of:
A) rising and falling sea levels that greatly impact photosynthetic activity.
B) variations in solar activity that produce different levels of radiation.
C) Milankovitch cycles of periodic variations in Earth's orbits around the sun.
D) lunar cycles in which the moon orbits at different distances from the Earth.
C) Milankovitch cycles of periodic variations in Earth's orbits around the sun.
You might also like to view...
Jet streams
A) blow west to east in the Northern Hemisphere and east to west in the Southern Hemisphere. B) follow a straight path near the surface. C) straddle the equator and the poles, creating a north-south wind pattern. D) blow west to east in both hemispheres.
Spectral models
A) look at a small section of the atmosphere. B) are useful only for short-range forecasts. C) include the NGM. D) interpret the atmosphere in terms of changes in waves. E) all of the above
Which of the following features would you find in an ocean basin? CHOOSE ALL THAT APPLY.
a. circum-Pacific mountain belt b. Peru-Chili Trench c. Mid-Atlantic Ridge d. the Alps e. Canadian shield
The average age that a newborn can expect to attain in a given society is referred to as
A. Survivorship B. Life span C. Life age D. Life expectancy E. Infant mortality