21. The Rhine river of northern Europe empties into
22. The place where material is excavated when the zone of maximum stream velocity approaches the stream's bed is called
23. The planets called the inner planets are
24. The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to
25. The planets that are called superior planets are
26. The phenomenon associated with collision and subduction of the planet is
27. The products of ____ are a major source of sediments for erosion and ____
28. The polar regions of earth cannot support forest growth because
29. The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as
30. The ridges of the waves are where the jet stream of waves closes to the
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