The is the main energy source on Earth. Approximately 50% of the solar energy hitting the Earth is absorbed by and .

Why have some historians rejected the labels bc and ad as laels for periods in world history

What is the significance of the battle of saratoga? a. the defeat at saratoga allowed the british to invade new england by land. b. after the defeat at saratoga france refuse to sign a treaty with the united states. c. the british won a decisive victory at saratoga. d. after the victory at saratoga france gave open support to the united states including arms money and ships.

What was one effect of the emancipation proclamation on african americans in the north?