What are two examples of heat or pressure that can form metamorphic rock?

Two of the most well-known examples of  metamorphic rocks are limestone changing to marble, and shale changing to slate. Please have in mind that Marble is formed from limestone when the limestone is affected by heat and high pressure during the process that we call as metamorphism. And Slate is a metamorphic rock that is created by the alteration of shale or mudstone by the same process

Characteristic expected of mineral from lava at earth's surface

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.