4th Grade Science

Studying Earth systems, energy transfer, and the scientific method for fourth grade students.

Basic Concepts

Earth's Four Systems

What Are Earth's Four Systems?

Earth is made up of four main parts called "systems" that all work together to make our planet a great place for life. These are:

  • Geosphere: The solid part of Earth, like rocks, mountains, and soil.
  • Hydrosphere: All the water on Earth, including oceans, rivers, lakes, and even ice.
  • Atmosphere: The layer of gases around Earth, like the air we breathe.
  • Biosphere: All the living things—plants, animals, and people!

How Do These Systems Interact?

These systems are always working together. For instance, rainwater (hydrosphere) nourishes plants (biosphere) that grow in soil (geosphere), and animals breathe air (atmosphere).

Why Is This Important?

Understanding how these systems interact helps us take care of our planet. If one system is harmed, the others can be affected too.

Fun Facts

  • Volcanoes (geosphere) can release gases into the atmosphere.
  • Plants (biosphere) help clean the air in the atmosphere.

Real-World Connections

Many environmental problems happen when these systems get out of balance, like when pollution in the atmosphere affects plant and animal life.

Examples

  • A tree (biosphere) grows in soil (geosphere) and absorbs water (hydrosphere) and carbon dioxide from the air (atmosphere).

  • A river (hydrosphere) carries rocks (geosphere) and provides a home for fish (biosphere).

In a Nutshell

Earth has four main systems—geosphere, hydrosphere, atmosphere, and biosphere—that interact to support life.

Key Terms

Geosphere
The solid, rocky part of the Earth.
Hydrosphere
All the water found on, under, and above the Earth.
Atmosphere
The layer of gases that surrounds Earth.
Biosphere
All living things on Earth.