Lightning is an electric discharge between a positively charged area and
a. a rising air mass.
c. another positively charged area.
b. a source region.
d. a negatively charged area.

It's 90 °f in the shop with high humidity. what pressure will be shown on the high-side pressure gauge (ac system on)?             a.  10 to 50 psi    b.  40 to 140 psi  c.  210 to 290 psi  d.  at least 350 psi

Explain how you might determine the rate of weathering on a sample rock

In this food web, which group would increase in number if snakes were eliminated? a. producers b. decomposers c. primary consumers d. secondary consumers e. tertiary consumers