Mineral composition is a key characteristic that provides evidence about the environment in which a rock was formed. Different minerals form under specific temperature, pressure, and chemical conditions, offering valuable clues about the geological processes that shaped the rock.
The characteristic that provides the best evidence that obsidian rock formed in an extrusive environment is its glassy texture. This texture indicates rapid cooling of molten lava, preventing the formation of large crystals. Additionally, the presence of gas bubbles or vesicles can further suggest that the lava cooled quickly upon exposure to the surface environment.
A metamorphic rock formed from limestone is known as marble. Marble is created when limestone undergoes intense heat and pressure over time, causing its minerals to recrystallize and form a new, harder rock with a characteristic crystalline texture.
Texture
texture
Mineral composition is a key characteristic that provides evidence about the environment in which a rock was formed. Different minerals form under specific temperature, pressure, and chemical conditions, offering valuable clues about the geological processes that shaped the rock.
The characteristic that provides the best evidence that obsidian rock formed in an extrusive environment is its glassy texture. This texture indicates rapid cooling of molten lava, preventing the formation of large crystals. Additionally, the presence of gas bubbles or vesicles can further suggest that the lava cooled quickly upon exposure to the surface environment.
The most noticeable characteristic of sedimentary rock is its layered appearance, which is known as "bedding." These layers are formed over time as different sediment deposits accumulate and are compressed together.
The glassy texture of obsidian is the best evidence that it formed in an extrusive environment. Obsidian is rapidly cooled lava with no time for crystal growth, resulting in a smooth, glass-like texture.
earthquakes made the rock cave in
A metamorphic rock formed from limestone is known as marble. Marble is created when limestone undergoes intense heat and pressure over time, causing its minerals to recrystallize and form a new, harder rock with a characteristic crystalline texture.
Texture
A rock formed from crushed shells and coral is known as coquina. Coquina is a sedimentary rock that is composed of fragmented shell and coral debris cemented together. It is commonly found along coastlines and can have a characteristic porous appearance.
The property that best describes a rock formed from sediments is sedimentary. Sedimentary rocks are formed through the accumulation and consolidation of sediments, such as sand, silt, and clay, over time. These rocks often have distinct layers and can contain fossils.
Slate is not typically formed from granite. Granite is a coarse-grained intrusive igneous rock, while slate is a fine-grained foliated metamorphic rock. Slate is often formed from shale or mudstone through low-grade metamorphism, where the minerals in the original rock recrystallize and align to create the characteristic foliation of slate.
texture
texture