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Dark igneous rock formed from lava?
obsidian obsidian
What is dark glassy volcanic rock called?
obsidian
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What does obsidian mean in rocks and minerals?
Obsidian is black glass formed by volcanoes.
What are rocks that have a glassy texture called?
Obsidian
What type of rocks are pumice obsidian and granite?
Igneous rocks
Smooth glassy rock that is formed when lava cools?
Obsidian
What are some different types of lava rocks?
Some different types of lava rocks include basalt, andesite, rhyolite, and obsidian. Basalt is the most common type and is dark in color with a fine-grained texture, while andesite is similar but contains more silica. Rhyolite is light in color with a high silica content, and obsidian is a dark, glassy rock formed from rapidly cooled lava.
Smooth glassy rock?
Obsidian: Its texture is glassy. Obsidian is extrusive or volcanic, because the instantaneous cooling that produces such rocks is a surface phenomenon. Obsidian is amorphous, so, unlike true rocks, it is not composed of minerals.
What rock is a obsidian and basalt?
Obsidian is a volcanic glass formed from rapidly cooling lava, while basalt is a fine-grained, dark-colored igneous rock formed from the solidification of lava flows. Both rocks are commonly found in volcanic areas and have high silica content.
What is a glassy rock?
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
Pumice obsidian and scoria are kinds of?
volcanic rocks formed from different processes. Pumice is a light and porous rock formed from foamy lava, obsidian is a dark volcanic glass formed from quickly cooled lava, and scoria is a dark, vesicular rock formed from gas-rich lava.
