10 Questions MCQ Test Geography for UPSC CSE - Test: Inside Our Earth
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______ minerals are found in the continental masses.
Detailed Solution for Test: Inside Our Earth - Question 2
The main mineral constituents: (i)Continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina). (ii) The oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium).
What is the name of the rock which contains fossils?
Detailed Solution for Test: Inside Our Earth - Question 3
There are three main types of rock: (i) Igneous rocks form from molten rock, and rarely have fossils in them. (ii) Metamorphic rocks have been put under great pressure, heated, squashed or stretched, and fossils do not usually survive these extreme conditions. (iii) It is only sedimentary rocks that contain fossils.
The inner and outer cores are together about 3500 km thick, and the core has a very high temperature and pressure. Why is the core also known as NiFe?
Detailed Solution for Test: Inside Our Earth - Question 6
The core is the innermost layer, divided intothe outer core and the inner core.
It is mainly made up of Nickel and Iron, therefore, it is also called nife.
Its radius is about 3500 km and the temperature and pressure of the central core are very high.
Detailed Solution for Test: Inside Our Earth - Question 8
A Fossil is any preserved remains, impression, or trace of any dead organism which was living in the past from a different geological age. Example: Bones or stone imprints of animals or microbes, exoskeletons, shells, objects preserved in petrified wood, oil, coal, and DNA remnants.
The study of fossils is known as “Palaeontology”. This includes the study about their age, the method of formation, and evolutionary significance. If the age or time of some specimens is over 10,000 old years, they are considered to be fossils.
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