Technological advancements have had the effect of the cultural exchange between nations.

increasing
decreasing

Why might have people followed the rivers to find their way into asia

Compounds which are found naturally in the earth are called: a. ores b. composites c. rocks d.minerals

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before