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Why are mangrove swamps an important part of the ecosystem of west africa?

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit a texture.