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The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
The remedies to soil erosion are:
I. Contour bunding
II. Regulation of land use
III. Cutting of trees
IV. Allowing grazing of animals
The Grand Canyon is located on the:
Extensive deserts occur in the western tropical regions of continents because:
Trees are leafless for a shorter or longer season of the year in:
The sunlight is available 24 hours on the longest day at which of the following latitudes of the earth?
Which one of the following is igneous rock?
What is called the coastal part of water bodies of the ocean which is structurally part of the mainland of the continents?
In which of the following is the Great Barrier Reef located?
Blizzards are characteristic features of—