Students gain a better understanding of why liquid water is important for life and why NASA plans to “follow the water” in its effort to find evidence for life on Mars.
• Students characterize the solubility of three solutes (salt, sugar, and cornstarch) in three solvents (water, vegetable oil, and rubbing alcohol).
• Students compare the abundance of three solvents (water, crude oil, and alcohol) found at and near the surface of Earth.
• Students discuss relative ease of evaporation of water, oil and alcohol.
• Through the above explorations, students draw conclusions regarding possible reasons why liquid water is important for living systems on Earth.
• Through an extension activity, students explore the relationship between plant productivity and annual precipitation.
NATIONAL SCIENCE STANDARDS
|Grade Level |Content Area |Content Standard |Guides to Content Standards |
|5-8 |Science as Inquiry |Abilities necessary to do scientific |Design and conduct a scientific investigation |
| | |inquiry | |
|5-8 |Science as Inquiry |Abilities necessary to do scientific |Think critically and logically to make |
| | |inquiry |relationships between evidence and |
| | | |explanations |
|5-8 |Science as Inquiry |Abilities necessary to do scientific |Communicate scientific procedures and |
| | |inquiry |explanations |