Why is it harder for the earth to recover from some natural disasters now?

a) human influence may compound the damage.

b) the natural disasters have gotten worse.

c) this statement is not true.

d)the natural disasters all happen at the same time these days.

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o