grade 3 science lesson

1. Earth
and
Weather

2. How can a tree break
?apart rock
A tree`s roots can grow in the
cracks of a rock.
As the roots get bigger, they can
. push the rock apart
21
7

6. tornado
The air was humid on that day, and the
.sky looked dark and greenish

7. Greenish sky

8. First, The tornado sirens began to
wail. people took cover underground.
Next, hailstones started to fall. The
wind began knocking down trees and
poles.
Finally, the tornado arrived. It
sounded like a freight train as it
ripped off roofs, pulled up trees,
.and overturned cars

9. Tornado sirens

10. Hailstones