Earth's first semi-permanent atmosphere consisted of abundant water vapor, carbon dioxide, nitrogen, ammonia, and traces of methane. These gases came from:. a. degassing of the oceans.
b. volcanic outgassing.
c. physical weathering of rocks.
d. remaining gases of the solar nebula.

The solstices and equinoxes, and the number of hours of daylight associated with each, are major factors in the seasons. use the drop-down menus to identify the month when each of these events occurs. the winter solstice in the northern hemisphere: an equinox in both hemispheres: the summer solstice in the northern hemisphere:

Put these ecosystems in order of least biodiversity to most biodiversity 1. mediterranean forest 2. indonesian rain forest 3. arctic ocean

The fact that similar fossils are found on both sides of the ocean is evidence of: a. global positioning. b. magnetic reversal. c. continental drift. d. oceanic drifts. select the best answer from the choices provided a b c d