Chemical a. is caused by freezing b. breaks apart rocks by physical process c. occurs when chemical reactions dissolve or change the minerals in rocks d. none above

The correct choice is C)

Occurs when chemical reactions dissolve or change the minerals in rocks

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals and soluble salts. Water, and many chemical compounds found in water are the main agents of chemical weathering. These reactions occur particularly when the water is slightly acidic.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

let that person have a turn to speak : )