Identifying the Three Types of Rocks

The video tutorial introduces the three main types of rocks: igneous, sedimentary, and metamorphic. It explains how igneous rocks form from cooled magma or lava, sedimentary rocks from pre-existing rock particles or dissolved materials, and metamorphic rocks from heat and pressure. The tutorial provides tips for identifying these rocks, noting that igneous rocks often have visible crystals, sedimentary rocks can be identified by their grainy texture, and metamorphic rocks may show mineral alignment. It also discusses the characteristics of each rock type, such as the density of igneous rocks and the recycling nature of sedimentary rocks.

Which type of rock is formed from molten rock that cools and solidifies?

• Sedimentary

• Metamorphic

• Igneous

• Limestone

What is the process called when sedimentary rocks are formed from pre-existing rocks?

• Recycling

• Crystallization

• Sedimentation

• Metamorphism

Which type of rock is formed through heat and pressure?

• Igneous

• Sedimentary

• Metamorphic

• Granite

What is a good indicator that a rock is igneous?

• Bubbling with acid

• Soft texture

• Layered appearance

• Presence of individual crystals

What characteristic is often seen in metamorphic rocks?

• Bubbling with acid

• Soft texture

• Presence of fossils

• Alignment of mineral grains

How can you identify a sedimentary rock by touch?

• It feels heavy

• It feels gritty

• It feels smooth

• It feels light

What happens when you put a drop of dilute acid on limestone?

• It changes color

• It bubbles and fizzes

• It becomes soft

• It remains unchanged

Tags

NGSS.MS-PS1-2

Which type of rock is often referred to as 'soft rock'?

• Metamorphic

• Granite

• Igneous

• Sedimentary

What is a common characteristic of basalt, an igneous rock?

• Soft texture

• Presence of fossils

• Uniform and dense

• Layered appearance

What is a good indicator of a sedimentary rock when viewed from the edge?

• Presence of individual crystals

• Layered stacks of fine clay minerals

• Alignment of mineral grains

• Uniform and dense appearance

Tags

NGSS.MS-ESS1-4