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Smog is a combination of:
A biome is:
Blizzards are characteristic features of—
A place where there is constant intermingling of salt water and fresh water is
How much of world’s surface is covered by water?
A broad, low embankment built up along the banks of a river channel during floods is called:
Plantation of trees on a large scale to check soil erosion are called:
The surface temperature of the sun is estimated as:
Mounds of sand formed by wind action are called:
The light from the Sun reaches the Earth in about—