What term describes elements with properties that fall between those of metals and nonmetals?

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world