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Describe the texture of obsidian?
Obsidian is a hard, dark volcanic rock that is formed by the rapid solidification of lava. Its texture is glassy and shiny black.
What is the glassy surface on a clay vessel called?
It is called a glaze.
What is the difference between texture and composition?
BASCILY texture is feel of something an Composition is what does it take to make up something.Texture is based on the sizes, shapes and position of the rocks grains. The Composition of a rock is determined by the minerals that make up the rock. Composition and texture are two characteristics that scientists use to classify rocks.
What is Lava that flows slowly to form a glassy surface with rounded wrinkles called?
The lava is pahoehoe Lava.
What are igneous extrusions?
== == Extrusive igneous rocks are formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component minerals, normally creating a fine grained texture as opposed to intrusive igneous rocks which have a coarser texture. Examples of extrusive igneous rocks would include obsidian, pumice, basalt, and rhyolite.
