Consider the following statements
1. Igneous rocks are the oldest rocks, while metamorphic are being derivative of igneous rocks and sedimentary rocks.
2. Resistance to weathering and erosion is less to metamorphic rocks compared to igneous rocks
3. Tendency to react with acids is higher to metamorphic rocks when compared to igneous rocks.
Which of the above statement(s) is/are correct?
Consider the following statements
1. Igneous rocks are the oldest rocks, while metamorphic are being derivative of igneous rocks and sedimentary rocks.
2. Resistance to weathering and erosion is less to metamorphic rocks compared to igneous rocks
3. Tendency to react with acids is higher to metamorphic rocks when compared to igneous rocks.
Which of the above statement(s) is/are correct?
The correct option is D All of the above
Igneous Rocks
Igneous rocks are the oldest type of rocks on the earth. All the other types of rocks are formed from igneous rocks. Igneous rocks are formed when magma (molten materials) rise from the earth’s interior. Igneous rocks can be sub classified further according to their depth of formation. The rocks that form below the earth surface are called as intrusive igneous rocks, and rocks that form on the earth surface are called extrusive igneous rocks (volcanic rocks). These rocks contain silica 40% to 80%. Magnesium and iron are important among others. Granite, pegmatite, gabbro, dolerite, and basalt are some examples for igneous rocks.
Metamorphic Rocks
Metamorphic rocks are formed due to metamorphism from existing igneous or sedimentary rocks, or even from existing metamorphic rocks. When existing rocks undergo changes due to high pressure and/or high temperature and/or high shearing stresses, metamorphic rocks are formed.
Usually metamorphic rocks are formed deep in the earth. Heat comes from magma, while pressure comes from the layer of rocks on top of the other layers. Metamorphic rocks are classified based on foliation as foliated rocks and non-foliated rocks. Foliation means the existence of series of parallel
surface. These rocks usually contain crystal. Gneiss, slate, marble, and quartzite are some of the metamorphic rocks.
What is the difference between Igneous Rocks and Metamorphic Rocks?
Igneous rocks are the oldest rocks, while metamorphic are being derivative of igneous rocks and sedimentary rocks.
Igneous rocks are the major proportion (nearly 95%) of the total rocks, while metamorphic rocks are found in a very small percentage.
Igneous rocks are made up of two or more minerals, while metamorphic rocks are usually made up of only one mineral.
Igneous rocks have no fossils, while, metamorphic rocks rarely have fossils.
Metamorphic rocks are harder than igneous rocks. Resistance to weathering and erosion is less to metamorphic rocks compared to igneous rocks. Tendency to react with acids is higher to metamorphic rocks when compared to igneous rocks.
Igneous Rocks
Igneous rocks are the oldest type of rocks on the earth. All the other types of rocks are formed from igneous rocks. Igneous rocks are formed when magma (molten materials) rise from the earth’s interior. Igneous rocks can be sub classified further according to their depth of formation. The rocks that form below the earth surface are called as intrusive igneous rocks, and rocks that form on the earth surface are called extrusive igneous rocks (volcanic rocks). These rocks contain silica 40% to 80%. Magnesium and iron are important among others. Granite, pegmatite, gabbro, dolerite, and basalt are some examples for igneous rocks.
Metamorphic Rocks
Metamorphic rocks are formed due to metamorphism from existing igneous or sedimentary rocks, or even from existing metamorphic rocks. When existing rocks undergo changes due to high pressure and/or high temperature and/or high shearing stresses, metamorphic rocks are formed.
Usually metamorphic rocks are formed deep in the earth. Heat comes from magma, while pressure comes from the layer of rocks on top of the other layers. Metamorphic rocks are classified based on foliation as foliated rocks and non-foliated rocks. Foliation means the existence of series of parallel
surface. These rocks usually contain crystal. Gneiss, slate, marble, and quartzite are some of the metamorphic rocks.
What is the difference between Igneous Rocks and Metamorphic Rocks?
Igneous rocks are the oldest rocks, while metamorphic are being derivative of igneous rocks and sedimentary rocks.
Igneous rocks are the major proportion (nearly 95%) of the total rocks, while metamorphic rocks are found in a very small percentage.
Igneous rocks are made up of two or more minerals, while metamorphic rocks are usually made up of only one mineral.
Igneous rocks have no fossils, while, metamorphic rocks rarely have fossils.
Metamorphic rocks are harder than igneous rocks. Resistance to weathering and erosion is less to metamorphic rocks compared to igneous rocks. Tendency to react with acids is higher to metamorphic rocks when compared to igneous rocks.
