Rocks and Minerals

Question 1

98% of Earth Crust is made up of which 8 elements?

Answer 1

O2, Si, Al, Ma, Fe, Na, K, Ca

Question 2

Rest of the 2% of Earth Crust is made up of which elements?

Answer 2

H2, C, S, Ti, Mn, Ni, and other elements

Question 3

Basic source of all minerals is?

Answer 3

Hot Magma

Question 4

About streak

Answer 4

Streak: Color of the ground powder

Examples:
(i) Malachite → Green Streak
(ii) Fluorite → White Streak (Irrespective of its color)

Question 5

Hardness of minerals order

Answer 5

Remember: TG CFA For Quarantine To Chennai Delhi

Talc < Gypsum < Calcite < Fluorite < Apatite < Feldspar < Quartz < Topaz < Corundum < Diamond

Question 6

Examples of Igneous Rocks

Answer 6

Granite, Gabbro, Pegmatite (Quartz and Feldspar), Basalt, Volcanic Breccia, Tuff, Dolerite, etc.

Question 7

Igneous Acidic Rocks

Answer 7

Granite, Quartz, Feldspar, etc.

Question 8

Igneous Basic Rocks

Answer 8

Basalt, Gabbro, Dolerite, etc.

Question 9

Mechanically Formed Sedimentary Rocks (Clastic Rocks)

Answer 9

Sandstone, Conglomerate, Mudstone, Claystone, Shale, Loess, etc.

Question 10

Chemically Formed Sedimentary Rocks

Answer 10

Chert, Halite, Potash, Nitrates, etc.

Question 11

Organically Formed Sedimentary Rocks

Answer 11

Geyserite, Chalk, Limestone, Coal, etc.

Question 12

Metamorphic Rocks

Answer 12

1. Marble ← Limestone & Dolomite
2. Quartzite ← Sandstone
3. Slate ← Shale
4. Gneiss ← Granite
5. Schist/Phyllite ← Slate