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Igneous Rocks are the primary rocks of the earth’s crust. Which of the following statements are correct regarding the igneous rocks?
1. They are formed by cooling and hardening of magma.
2. Igneous rocks are most likely to have fossils in them.
3. Intrusive igneous rocks have bigger crystals than extrusive igneous rocks.
Select the code from following:
1 only
2&3 only
1&3 only
All of the above
Types of Rocks:The three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed. Sedimentary Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material. Together, all these particles are called sediment. Gradually, the sediment accumulates in layers and over a long period of time hardens into rock. Generally, sedimentary rock is fairly soft and may break apart or crumble easily. Metamorphic Metamorphic rocks are formed under the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure (squeezing). The rocks that result from these processes often have ribbonlike layers and may have shiny crystals, formed by minerals growing slowly over time, on their surface.Examples of this rock type include gneiss and marble. Igneous Igneous rocks are formed when magma (molten rock deep within the earth) cools and hardens. Sometimes the magma cools inside the earth, and other times it erupts onto the surface from volcanoes (in this case, it is called lava). When lava cools very quickly, no crystals form and the rock looks shiny and glasslike. Sometimes gas bubbles are trapped in the rock during the cooling process, leaving tiny holes and spaces in the rock.Examples of this rock type include basalt and obsidian.
By: Shubham Tiwari ProfileResourcesReport error
PARDEEP SINGH
question is not complete ... whether to select correct statement or incorrect
Kindly read the question carefully. The question is asking about correct statement.
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