According to the article about coral reefs, which of the following problems is threatening the world's reefs today?

A.

heavy winds

B.

freezing air temperatures

C.

rising sea temperatures

D.

lower pollution

The Mediterranean Sea has very little sediment churned up and suspended in its waters, mainly because of the absence of any substantial ocean tides.

If we are walking upstream or downstream along a dry mountain stream if you notice that the shape of sediment is getting more angluar as you continue walking?

Meteorites are most commonly made of which two materials? sand stone glass gas iron

Why can't contour lines cross? a. mountains and valleys are different. b. a location can only have one elevation. c. it would make the map too difficult to read. d. terrain can only be going up or heading down.

Which of the following statements is NOT true with regards to fracking? Provides an alternative energy source Increased production of oil and natural gas Contamination of groundwater Causes earthquakes

How does having a large lake or an ocean nearby affect the climate of an area?

In order to conquer Mexico, the Spanish

The climate of the United States can be best Described as. A. mostly arid B. mostly tundra C. Mostly Temperature D. Mostly tropical

Who is Nathaniel Greene

Who was one of the founders of the location-sharing site Foursquare? Dennis Crowley Aaron Swartz Josh Williams Scott Raymond Done answer A.