An Acid Is a Chemical Compound That Gives Off Hydrogen

Q36: The _ horizon is the uppermost layer

Q37: Ordinary rain has a pH of about

Q38: _ are the most common materials precipitated

Q39: Frost wedging is most effective _.<br>A)

Q40: A _ soil is one that develops

Q42: The B-horizon in soil is the zone

Q43: Chemical weathering generally proceeds _.<br>A) at about

Q44: Clay minerals help hold water and clay

Q45: The single most important agent for the

Q46: Water can combine with iron oxide to