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Q: The light weight aggregates are obtained from
  • A. sedimentary rocks
  • B. metamorphic rocks
  • C. igneous rocks
  • D. volcanic source
Correct Answer: Option D - Igneous rocks also known as primary, unstratified or eruptive rocks are of volcanic origin and are formed as a result of solidification of molten mass lying below or above the earth's surface. • During volcanic eruptions, ashes and sands are mixed with molten lava to form tuff lava. • Tuffs have a glassy structure due to rapid cooling and are used as aggregate for light weight concrete. • Pumice, Dolomite are light weight aggregate are obtained from volcanic source.
D. Igneous rocks also known as primary, unstratified or eruptive rocks are of volcanic origin and are formed as a result of solidification of molten mass lying below or above the earth's surface. • During volcanic eruptions, ashes and sands are mixed with molten lava to form tuff lava. • Tuffs have a glassy structure due to rapid cooling and are used as aggregate for light weight concrete. • Pumice, Dolomite are light weight aggregate are obtained from volcanic source.

Explanations:

Igneous rocks also known as primary, unstratified or eruptive rocks are of volcanic origin and are formed as a result of solidification of molten mass lying below or above the earth's surface. • During volcanic eruptions, ashes and sands are mixed with molten lava to form tuff lava. • Tuffs have a glassy structure due to rapid cooling and are used as aggregate for light weight concrete. • Pumice, Dolomite are light weight aggregate are obtained from volcanic source.