Which weathering process involves the constant freezing and thawing of water?

True

Explanation:

If we eat an hour before the exercise then our body gets enough energy to carry out the physical activities. Extending more than two hours of a meal before the exercise is not advisable.

Consuming carbohydrate and protein rich food after the exercise is a must as it stimulates the synthesis of muscle protein. Working out in an empty stomach or after a light meal is not suggested as the body burns more fat during the exercise even when enough food is not consumed.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.