OBJECTIVE FORESTRY

FORESTRY

SOIL SCIENCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Obsidian, granite, and basalt are rocks formed from molten rock that has cooled. What kind of rocks are they?
A
sedimentary rock
B
igneous rock
C
metamorphic rock
D
fossils
Explanation: 

Detailed explanation-1: -Igneous rocks are defined as types of rocks that are formed when molten rock (rock liquefied by intense heat and pressure) cools to a solid state. Lava is molten rock flowing out of fissures or vents at volcanic centres (when cooled, they form rocks such as basalt, rhyolite, or obsidian).

Detailed explanation-2: -Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies.

Detailed explanation-3: -The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

Detailed explanation-4: -Igneous rocks are formed by cooling, solidification, and crystallization of magma/lava.

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