2024年6月17日 · What type rock forms when magma cools and hardens? Igneous rock forms when magma cools and hardens. This type of rock can be classified as intrusive (plutonic) if it …

2024年6月12日 · Obsidian is a name given to a type of igneous rock. Obsidian is extrusive, meaning it forms outside the earth in open air as opposed to inside the ground. Obsidian is …

2024年6月15日 · Obsidian is an extrusive igneous rock formed from the rapid cooling of lava at the Earth's surface. It is usually black in color and has a glassy texture due to its quick cooling …

2024年6月14日 · Obsidian is a volcanic glass which forms when a high silica melt solidifies quickly after eruption. Organic and chemical are terms used to classify sedimentary rock. …

2024年6月8日 · Obsidian is an igneous rock due to the nature in which it was formed. Obsidian is formed when lava from volcanoes is hurled high into the air, cools quickly upon falling and …

2024年10月1日 · Igneous rock forms when molten rock, or magma, cools and solidifies. Depending on where and how the cooling occurs, igneous rocks can be classified as intrusive …

2024年5月27日 · The smooth glassy rock that forms when lava cools rapidly is known as obsidian. Obsidian is a type of volcanic glass that lacks a crystalline structure due to its quick …

2024年6月16日 · Obsidian is an extrusive rock and is formed from rapidly cooling magma. Obsidian is also known as volcanic glass and one can find only sub-microscopic crystals in it. …

2022年11月4日 · obsidian is an igneous rock, it is not formed from sediment, or a rock going under heat and pressure for the second time it is formed when a volcano erupts and it cools …

2024年6月21日 · What type of rock will float on water? ... To maintain the shine of an obsidian rock, you can polish it using a soft cloth and a commercial jewelry polish. To reveal the colors …