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Inside our Earth Test - 7

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Inside our Earth Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The Sima layer is formed of _______ and _________.
    Solution
    The Sima layer is formed of silica and magnesium. This layer is below top layer and made up of basalt rock which is heavier than the topmost layer. The density of the layer varies from 3.1 to 5.00. the average thickness of this layer is 100 to 2900 km.
  • Question 2
    1 / -0
    Most of the continents are formed of ________ layer.
    Solution
    Most of the continents are formed of SiAl layer, i.e., Silica and Aluminium. The upper layer of the Earth's crust is called lithosphere and has 2 parts- upper part forms continents SiAl has a density of 2.7. The lower part is denser and is called SiMa (Silica, Iron, Magnesium).
  • Question 3
    1 / -0
    Which of the following is an igneous rocks?
    Solution

    Basalt is a dark-coloured, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro. The difference between basalt and gabbro is that basalt is a fine-grained rock while gabbro is a coarse-grained rock.

  • Question 4
    1 / -0
    Granite is an example of ______________.
    Solution
    Igneous rocks are formed through the cooling and solidification of magma or lava. Granite is a light-colored igneous rock. It is composed mainly of quartz and feldspar with a little amount of mica, amphiboles and other minerals.
  • Question 5
    1 / -0
    The average thickness of the crust is _____ km below the continent and _____ km below the ocean.
    Solution
    The average thickness of the crust is 35 km below continents, 6 km below oceans (plus 5 km of sea water). 
  • Question 6
    1 / -0
    Tick the correct answer.
    The thinnest layer of the earth is?
    Solution
    The thinnest layer of the earth is Crust.
    The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet's volume.
  • Question 7
    1 / -0
    Tick the correct answer.
    The innermost layer of the earth is?
    Solution
    The innermost layer of the earth is known as the core. It is divided into inner core and outer core. It comprises of a high concentration of nickel and iron.
  • Question 8
    1 / -0
    The word 'Igneous' is derieved from the latin word 'ignis' which mean _____________.
    Solution
    The word 'igneous' is derived from a Latin word 'ignis' meaning fire. Igneous rocks are known as primary rocks as they are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.
  • Question 9
    1 / -0
    Remain of plants and animals under the earth:
    Solution
    • A fossil is any preserved remains, impression or trace of any once-living thing (plants, animals etc) from a past geological age. 
    • Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood, oil, coal, and DNA remnants. 
    • Hence, Remain of plants and animals under the earth are Fossils.
    • So, the correct answer is 'Fossils'.
  • Question 10
    1 / -0
    Which of the following is not an intrusive igneous rock?
    Solution
    Laccolith,dyke and batholith are all examples of intrusive igneous rock.
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