Which is a cause of desertification? A. farming
b. creating reservoirs
c. overgrazing
d. driving motor vehicles?

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is most likely effect on the ecosystem?

What materials must dams have to produce electricity, and what must occur?