Which of the following rock is called primary rocks?

The correct answer is Igneous rocks.

Key Points

• Igneous rocks are called primary rocks because they are the first type of rocks to form on Earth.
• They are formed through the cooling and solidification of magma or lava.
• These rocks serve as the base material from which other rock types, such as sedimentary and metamorphic rocks, are derived.
• Examples of igneous rocks include granite, basalt, and pumice.

Additional Information

• Metamorphic rocks: These are rocks that have undergone a transformation due to intense heat, pressure, or chemical processes. Examples include marble (from limestone) and schist.
• Sedimentary rocks: These rocks are formed from the accumulation and compaction of sediments over time. They often contain fossils and are formed in layers. Examples include sandstone and limestone.
• Stratified rocks: These are layered rocks, which are typically sedimentary in origin, characterized by their distinct layers or strata.

Important Points

• Igneous rocks are the foundation of the rock cycle and give rise to sedimentary and metamorphic rocks through weathering, erosion, and other geological processes.
• Metamorphic and sedimentary rocks are secondary and tertiary rocks, which are derived from pre-existing rocks.
• The Earth's crust is predominantly composed of igneous rocks, either in their original form or as components of other rock types.