Water plays an important role in the chemical weathering of rock in 3-5 sentences identify and explain two agents of chemical weathering to support that statement

Weathering can be of three types: physical, chemical and biological. It consists of the disintegration of the rocks into smaller fragments, but without changing their nature. ... Oxidation consists in the reaction of oxygen dissolved in water with the substances that form the rocks.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

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.