Question

Consider the following sources:

1. Magma obtained from a volcanic eruption.
2. Materials obtained from the meteors.
3. Materials collected at different depths during the “Deep Ocean Drilling Project”.

Which of the above is/are not a direct source(s) of information about the interior of the Earth?
(a) 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1 and 2 only

Answer 1

2 only ...option a is the answer

Answer 2

Option A - 2 Only

More Information

■ Sources of information about the interior of the Earth :-

• There are two types of sources of information about the interior of the Earth viz. Direct and Indirect.

Direct sources :-

• The sources which are obtained directly from Earth’s interior are called Direct sources.

• These include materials obtained from Mining or from scientifi c projects such as “Deep Ocean Drilling Project” &“Integrated Ocean Drilling Project” and the Magma/Lava obtained from a volcanic eruption, etc.

• The drilling projects provide better sources of information than mining because they can provide materials from the depth as far as 12 km while in mining, going beyond 3-4 km depth is not possible due to high temperature and pressure at this depth.

Indirect sources :-

• These are the sources that are not obtained directly from the Earth’s interior but help in the understanding of the same.

• These include earthquake waves; materials obtained from meteors;earth’s gravitation, magnetic & seismic activities and the variability of temperature, pressure, and density of the Earth, etc.

• Although the materials obtained from meteors are not from the Earth these are similar to the Earth hence, they provide valuable information.

________