What is a Rock?
A rock is a solid material made up of one or more minerals. It is a naturally occurring substance that forms the Earth's crust.
Types of Rocks
There are three main types of rocks:
- Igneous Rocks: Formed from the cooling and solidification of molten rock, such as lava or magma. Examples include granite and basalt.
- Sedimentary Rocks: Formed from the accumulation and compression of sediments, such as sand, mud, and organic matter. Examples include limestone and sandstone.
- Metamorphic Rocks: Formed from the alteration of existing rocks through heat, pressure, or chemical processes. Examples include marble and slate.
Rock Cycle
The rock cycle is the continuous process of rock formation, alteration, and breakdown. It involves the transformation of rocks between the three main types through processes such as melting, cooling, erosion, and metamorphism.
Uses of Rocks
Rocks have various uses, including:
- Construction materials
- Art and sculpture
- Making jewelry
- As a source of minerals and resources
Fun Facts about Rocks
Did you know?
- The Earth's crust is made up of rock.
- Diamonds, one of the hardest natural substances, are formed from carbon under high pressure and temperature.
- Some rocks, such as pumice, can float on water.
Now that you've learned about rocks, you can explore the world around you and see how rocks play a vital role in shaping our planet!
[Rock] Related Worksheets and Study Guides:
.◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.