World Geography
The knowledge about the topography of the ocean basins has been derived from

seismic surveying
side-scan sonar
All of these
echo sounder

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World Geography
The Penumbra is

the outer portion of the moon's shadow
None of these
formed by the tangent that intersects between the sun and the moon
both (a) and (b)

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World Geography
The main objective of multi-purpose river projects are

flood controls and making rivers navigable
All of these
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
power generation by constructing hydro power stations

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