There are many claims on the web that Express Paid Surveys is a scam. The best place to find out is the Better Business Bureau, which now has a website of their own. You will see many listings, both negative and positive, by peoply who have used this service, and then you can make an informative decision on that question.
Obsidian
Basalt is on of the many rocks that is black, obsidian (a volcanic glass) is another.
No, obsidian is also called 'volcanic glass,' since it is a product of cooled lava. Since there are no volcanoes in Louisiana there will not be any natural obsidian.
All rock retains heat. Darker rocks such as schist or obsidian are darker and as a result store heat and retain it more efficiently. Sandstone is often lighter and more reflective.
Obsidian is volcanic glass, derived from the quick cooling of high silica lava.
Making a cutting tool using obsidian rock is quite easy. The cavemen used to smack pieces of obsidian with other rocks until the obsidian was thin and sharp as a knife.
Ancient people used obsidian ( rocks used to make weapons)
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Obsidian is black glass formed by volcanoes.
because an obsidian rock has low silica
Obsidian
Igneous rocks
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.
Obsidian rocks are commonly used in jewelry making, as they can be polished to a high shine. They are also used in surgical scalpels due to their sharp edges, as well as in archaeological tools for cutting and scraping. Additionally, obsidian is sometimes used in traditional medicine for its perceived metaphysical properties.
The Native Americans used the Igneous rock Obsidian as arrowheads. Granite is used as countertops and sculptures.
Obsidian blades and daggers as well as clubs with sharp rocks and shards of obsidian embedded in them. Arrows and darts sometimes tipped with poison were also used.
Obsidian blades and daggers as well as clubs with sharp rocks and shards of obsidian embedded in them. Arrows and darts sometimes tipped with poison were also used.