Year 4 · third unit
The Changing Land
The land seems to be standing still, but it is changing very slowly. It is only that our eyes are too slow to see it.
How does a great rock become soil?
A board to runRun a hundred thousand years. You will see what breaks the rock.
I poured water on flower-bed soil and playground soil
A board to adjustWhich will drain first? Pour the water.
I let water run down a mound of earth
A board to adjustHow will the top and the bottom come to differ? Set the amount of water, and drag the mound to change its slope.
