Magma.
The word that describes a narrow gap in a rock is "crevice." A crevice is typically a narrow opening or fissure formed by the natural processes of weathering and erosion in the rock. It can serve as a habitat for various organisms or as a pathway for water and other elements.
The word that describes the shapes and sizes of grains in a rock is "texture." Texture refers to the arrangement and size of mineral grains in a rock, whether they are fine-grained, coarse-grained, or other specific characteristics.
ignorance
The process you're referring to is called crystallization. This is when a liquid solidifies into a solid state due to a decrease in temperature.
The four-letter word you are looking for is "melt." It describes the process of a solid turning into a liquid as it is heated, such as ice melting into water.
steaming?
The word gaseous describes one of the shapes of an object. An object is in the gaseous state when its particles are moving the fastest, compared to the slower states of liquid and solid.
Lava
Texture.
avalanch
plummet
The word is folding
Thrashed?
crystalline
The anagram is lava, liquid rock that reaches the surface.
The word is "vaporization." It is the process where particles transition from a liquid state to a gaseous state, typically due to an increase in temperature.
extinct?