How Can We Provide Freshwater to those in Need

Label the four major Earth's systems.

a

b

c

d

biosphere

atmosphere

hydrosphere

geosphere

Nearly all of Earth's available water is

• salt water
• fresh water

• contaminated water

• river water

Most of Earth's freshwater is found in _________ , which is not available for human's to access.

• groundwater

• glaciers

• lakes

• rivers

Match the following word with the correct Earth system.

• atmosphere

• lakes

• hydrosphere

• soil

• biosphere

• plants

• geosphere

• clouds

Possible solutions to a problem are limited by available materials and resources. We call these limitations:​ ​ (a)  

• constraints
• data
• models
• inferences

Representations of objects, systems or events and used as  tools for understanding the natural world using familiar objects to represent unfamiliar things.

• models

• answers

• questions

• toolboxes

Put in order from highest percentage of Earth's freshwater to lowest.

• groundwater

• rivers

• lakes

• swamps/wetlands

• glaciers

97% of water on Earth is ​ (a)  

• saltwater
• freshwater

3% of Earth's freshwater is ​ (a)  

• freshwater
• saltwater

Most of Earth's freshwater is inaccessible because it is ___________.

• frozen
• saltwater

• dirty

• in the ground