In areas where freezing and thawing occur frequently, rocks weather rapidly because of the of freezing water. a. evaporation c. leaching b. expansion d. oxidation

b. expansion

Explanation:

The rapid freezing and thawing will be responsible for mechanical weathering of the rocks by the process of frost wedging. In this condition the temperature outside the rock causes the disintegration of the rock.

In cold temperature the water inside the rock get freezed and when the temperature outside the rock becomes normal the water attains it's liquid form this is called as thawing.

On freezing the surface area of the ice expands inside the rock which leads to the disintegration of the rock structure from inside. Thus results in weathering.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.