Lesson 13:
Today, my class and I grew our grass and used it to test “What would happen if we used grass in our science experiment?” The lesson was the same as lesson 12, but this time we planted grass.
- How did plants affect the way water flowed on the sloped land?
Since the plants have roots, when the water flowed, the roots held back the soil. This caused for there to be less sedimentation in the sediment.
- How did plants affect the way water eroded the soil?
The plants didn’t allow the water to erode the soil because the roots were holding on to the soil.
Lesson 12 and 13 Comparison:
- Look at your two cylinders from lesson 12 and 13. What do you observe about the contents of the two cylinders?
The graduated cylinder from lesson 12 had more dirt in it, than in the graduated cylinder from lesson 13.
- What conclusion can you make about how plants affect erosion and runoff?
The plants’ roots hold back the dirt which leads to less dirt in the sediment.
