Answer:
Greenhouse affect - atmosphere traps heat
Ice age - coldest phase of climate cycle
Sun's output - can vary
Greenhouse gases - atmosphere traps even more heat
C. Clay soil has a higher porosity than sandy soil.
Explanation:
Maller soil particles have smaller pore spaces, but a greater number of them, which leads to higher surface tension and high % porosity.
D. Eugenics
A popular example of this would be the nazi Germans obsession with blonde hair and blue eyes
a solar eclipse, when the moons shadow comes between the sun and earth
I think how long and how often.