PLEASE HELP!! Which statement describes the first step in soil formation?

A: Small, simple plants begin to grow.
B: Parent rock breaks into smaller pieces.
C: Humus begins to mix with sediment.
D: Organic material starts decomposing.

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!

Compare and contrast physical changes with chemical changes.