The hardness of a unknown mineral can be found by a) subjecting it to a strength test b) calculating its density c) comparing it to the other known samples using a scratch test d) grinding it on a streak plate

1. most of russia lies in a environment. a) alpine b) subarctic c) humid continental d) humid subtropical 2. the highest population density is found in the part of russia a) eastern b) northern c) southern d) western