Which element does NOT like to form compounds?
helium
sodium
nitrogen
oxygen

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Mosses, lichens and shrubs can be found where in russia? a.grasslands b.mountain regions c.coastal plains d.siberian tundra

8. is a technique that uses the images from several telescopes to produce a single image. a. reflection b. interferometry c. radiation d. refraction