Water Properties
What property of water lets it dissolve most things?
Water is the Universal Solvent
What is the difference between physical or chemical weathering?
Physical - rock becomes smaller
Chemical - rock changes color or molecules
What is an example of an impervious surface?
Concrete, asphalt, solid rock, etc.
In your procedures, what do you do first?
Get materials
What property lets a paperclip float on water
Surface Tension
A tree root grows into a rock and breaks it in half. Is this physical or chemical weathering?
Physical Weathering
What is an example of a non-impervious surface?
Grass, dirt, mulch, etc.
How can we test how the speed (fast or slow) of the water changes a stream?
Change the flow rate
A scientist notices the air temperature is 25°C and the water temperature is only 13°C. What property explains this?
High Heat Capacity
A car rusts after it rains. Is this physical or weathering
Chemical weathering
What is the name of the pollution water collects and "runs" into our rivers
Runoff
What data can we collect in an experiment about water and erosion?
Observe how much erosion, measure how much erosion, etc.
Why does water float when it freezes?
What becomes less dense when it freezes
Give an example of physical weathering
Erosion, ice breaking rock, tree roots breaking rock, etc.
Are there more or fewer impervious surfaces today than 50 years ago?
More impervious surfaces
How do we know if data is accurate in an experiment?
Do multiple trials, be exact with measuring, etc.
What property of water explains why erosion happens?
Cohesion/Adhesion
Give an example of chemical weathering
Rusting, acid rain, etc.
Why are more impervious surfaces bad for our water?
More impervious surfaces means more runoff and pollution in the water
What are procedures for testing how the speed of a stream affects erosion?
1.) Turn on the flow
2.) Wait 3 minutes
3.) Observe changes to stream
4.) Increase the flow
5.) Wait and observe again