What object did Ptolemy claim was at the center of the universe

Explain how tectonic forces created the Appalachian Mountains and describe how they have been shaped.

One use of ultraviolet radiation is ia absorbed by the ozone in the atmosphere and never reaches earth's surface

Should we allow more bottled-water companies to access Florida pristine springs or should we limit them to the minimum to preserve our dwindling clean water resources and the springs?

Fertilizers contain fixed nitrogen. how could the widespread misuse of this fertilizer lead to an imbalance in the oxygen cycle

English is the 2nd language and French is the 1st in this province.

5 3/8 + (6 3/4 - 4 1/8)

Which is accurate of the urban poor? A. They're often rural migrants with no title to housing or rights to established businesses. B. They live in apartment complexes. C. They have access to healthcare and obtain an education. D.

De ce sunt vulcanii activi in america?

How does still water affect glaciations?

What does lava become when it cools A. obsidian B. Basalt C. granite D. all lava could become either for of igneous rock