Types of Rocks and Their Formation Explained

The video explores the three main types of rocks: igneous, sedimentary, and metamorphic. It explains how each type is formed and provides examples of each. Igneous rocks form from cooled magma, sedimentary rocks from accumulated deposits, and metamorphic rocks from existing rocks under heat and pressure. The video also discusses specific examples like obsidian, granite, sandstone, and marble, highlighting their characteristics and formation processes.

What are the three basic types of rocks?

• Igneous, Sedimentary, Metamorphic

• Igneous, Volcanic, Metamorphic

• Sedimentary, Volcanic, Metamorphic

• Igneous, Sedimentary, Volcanic

Which type of igneous rock is formed when magma cools quickly on the Earth's surface?

• Intrusive

• Extrusive

• Sedimentary

• Plutonic

What is the main characteristic of granite?

• Porous texture

• Medium to coarse grain crystals

• Dark and dense

• Fine-grained texture

Which igneous rock is known for having a glass-like appearance?

• Granite

• Obsidian

• Basalt

• Scoria

How are sedimentary rocks primarily formed?

• From cooling magma

• From extreme heat and pressure

• From pre-existing rocks or organic material

• From volcanic eruptions

What type of sedimentary rock is composed of sand-sized grains?

• Limestone

• Conglomerate

• Sandstone

• Shale

Which sedimentary rock is often composed of marine organism skeletons?

• Shale

• Sandstone

• Conglomerate

• Limestone

What causes metamorphic rocks to form?

• Volcanic eruptions

• Accumulation of sediments

• Cooling of magma

• Extreme heat and pressure

Which metamorphic rock has a parent rock of limestone?

• Gneiss

• Marble

• Slate

• Quartzite

What is the parent rock of schist?

• Slate

• Marble

• Quartzite

• Gneiss