11- Which of these minerals constituent the innermost layer of the earth?
(A) Nickel and Magnesium
(B) Silica and Magnesium
(C) Silica and Aluminium
(D) Nickel and Iron
12- Which layer of the earth has high temperature and pressure?
(A) Lithosphere
(B) Crust
(C) Mantle
(D) Core
13- The …………..forms only 0.5 % of the volume of the earth?
(A) Crust
(B) Mantle
(C) Inner core
(D) Outer core
14- What percentage of the earth comes in the Mantle?
(A) 0.5
(B) 1.6
(C) 1.8
(D) 2.8
15- What is the radius of the earth?
(A) 4371 km
(B) 5371 km
(C) 6371 km
(D) 7371 km
16- The remains of dead plants and animals trapped in the layers of rocks are called……………
(A) Biosphere
(B) Biomes
(C) Fossils
(D) None of the above
17- A natural mass of mineral matter that makes up the earth’s crust is called ……………
(A) A Rock
(B) A Fossil
(C) Both A and B
(D) None of the above
18- ……………is formed through the cooling and solidification of magma or lava
(A) Sedimentary rocks
(B) Igneous rocks
(C) Metamorphic rocks
(D) None of the above
19- Igneous rocks are also called………………….
(A) Intrusive rocks
(B) Secondary rocks
(C) Primary rocks
(D) Metamorphic rocks
20- Intrusive rocks and extrusive rocks are different types of which rock?
(A) Lava rocks
(B) Sedimentary rocks
(C) Metamorphic rocks
(D) Igneous rocks
ANSWERS:
11-(D), 12-(D), 13-(A), 14-(B), 15-(C), 16-(C), 17-(A), 18-(B), 19-(C), 20-(D)