Wind, fossils and canyons
Answers are for parents and teachers.
1
Draw a dune with arrows to show how grains bounce up one side and roll down the other.
Arrows going up the windward side, over the top and down the far side.
2
A sandy pan has a heap 2 cm high before wind and 6 cm high behind a stone after wind. By how much did it grow?
6 − 2 = 4 cm.
3
Imagine a cliff with three layers: sandstone on top, limestone in the middle and mudstone at the bottom. Which is oldest? Which is newest?
Mudstone is oldest (bottom). Sandstone is newest (top).
4
Explain to someone at home why we can find sea fossils far from the sea.
The land was covered by a sea long ago; the animals were buried in sediment that became rock.
5
Improve this explanation: “A canyon is deep because it is.” Write a better claim and add evidence.
Claim: moving water eroded the rock for millions of years. Evidence: fast water cut a deeper channel in our tray.