Hidden Water Underground
Hidden water underground introduces Grade 5 students to groundwater — the large reserves of fresh liquid water stored in pores and spaces between rocks and sand particles in the geosphere. Since only a small fraction of Earth's water is freshwater (and much of that is frozen in glaciers), the accessible groundwater stored underground is critically important for human use. This lesson from Amplify Science (California) Grade 5, Chapter 1, explains where our drinking water comes from and how the geosphere acts as a hidden reservoir, like a sponge holding water below the surface.
Key Concepts
If we can't drink the ocean and we can't melt the glaciers, where do we get water? A lot of it comes from beneath our feet.
Large amounts of liquid freshwater are stored underground in the geosphere (Earth's rock and soil layers). This water, called groundwater , fills the tiny spaces between rocks and sand particles. It acts like a hidden sponge holding water for us to use.
Common Questions
What is groundwater?
Groundwater is fresh liquid water stored underground in the spaces between rocks, sand, and soil particles within Earth's geosphere. It is the primary source of drinking water for many communities.
How does water get underground?
Precipitation (rain and snow) seeps into the ground and slowly filters through soil and rock layers. Over time, this water accumulates in underground formations called aquifers.
Why is groundwater important if there are oceans?
Oceans are saltwater and cannot be drunk directly. Earth's freshwater supply is small — about 3% of all water — and much of it is frozen in glaciers. Accessible liquid freshwater largely comes from groundwater.
What does groundwater feel like underground?
Groundwater fills tiny pores and cracks between rock and sand particles, like water absorbed by a sponge. The rock layers holding this water are called aquifers.
How do humans access groundwater?
By drilling wells down into aquifers. Pumps then bring the water to the surface for drinking, irrigation, and other uses. Many cities and farms depend entirely on groundwater wells.
What grade and chapter introduces hidden groundwater?
Grade 5, Chapter 1 of Amplify Science (California): Why is East Ferris running out of water while West Ferris is not?