Why are some sedimentary rocks hard and others soft?

Plate tectonics is the theory that says the earth's crust is: A. spread across 12 land masses B. melting like hot molten lava C. broken into pieces D. freezing over time

Three reasons why southh africa must include renewable energy in its energy mix

If you were half way between the equator and the north pole and one quarter of the way around the earth west of the prime meridian you will be at:

Climate trends in the far north have shown considerable warming due to the global climate change during

What direction does a jet stream move across the U. S

The Gibraltar connects what two bodies of water?

Estonia, Lithuania, Ukraine, Belarus, and Moldova once comprised Yugoslavia. True False

Where do most volcanos form A) In the ocean B) Over a hotspot C) At plate boundaries

Which of these is not an environmental effect of destroying wetlands A. loss of habitat B. increased air temperature C. poor absorption of rain water D. unfiltered water

Iron atoms combine with oxygen atoms to form rust. Is this a physical property of iron or a chemical property?