13.The simplest pure substances that cannot be broken down into any other substances are called matter
c. mixtures.
bcompounds.
d elements.

Element

Explanation:

Element is a pure substance that cannot be broken down.

it's c. (to reduce the greenhouse effect/carbon gasses)

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.