Greek gods of mythology: which goddess personified the earth?

Questions

Hippopotamuses have killed more people in Africa than all the lions, elephants, and water buffalo combined, usually by ----------?

Cats have amazing hearing ability. A cat's ear has ---------- muscles that control the outer ear (by comparison, human ears only have six muscles). These muscles rotate 180 degrees, so the cat can hear in all directions without moving its head.?

The hummingbird's tiny ----------, 4.2% of its body weight, is proportionately the largest in the bird kingdom.?

The ---------- eagle of Africa hunts over a territory of 250 square miles a day.?

Of the 250-plus known species of shark in the world, only about 18 are known to be ----------?