Which is not an example of mechanical weathering?

a. rust on rocks.
b. ice wedging.
c. roots of trees breaking sidewalks.
d. pot holes.

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Pbco3 –> pbo+ co2. how many liters of carbon dioxide gas is produced from the decomposition of 32 grams of lead (ll) carbonate?

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.