According to Minerals.net, talc – the softest mineral on earth – is found worldwide. In the United States, important talc deposits are present in Vermont, Pennsylvania, Maryland, North Carolina and Montana.Know More
Talc is number 1 on the Mohs hardness scale and can be easily scratched with a fingernail. The mineral in its powdered form is associated with some health concerns, including a rare breathing disorder.
"Although solid forms of talc are assumed to be safe, and most concerns are only after prolonged exposure, it is advisable to wash hands after handling talc," Minerals.net states. In its mineral form, talc "has a greasy feel" and may be "lightly fluorescent."Learn more about Earth Science
Glossopteris fossils are found throughout India, South America, southern Africa, Australia and Antarctica. They are a key piece of evidence for the theory of a southern supercontinent and continental drift. Assembling the continents of the southern hemisphere into a single land mass shows a linear, continuous distribution pattern of Glossopteris across continental boundaries. Edward Seuss was the geologist who theorized the existence of a southern supercontinent, which he called Gondwanaland.Full Answer >
Fossils are primarily found in sedimentary rocks because these rocks form at low temperatures and pressures. Igneous rocks form at temperatures and pressures that are high enough to destroy any organic remains. On rare occasions, fossils are found in metamorphic rocks, but they are deformed by the heat and pressure.Full Answer >
The majority of freshwater on earth is found in frozen glaciers and ice caps. This frozen water accounts for 68.7 percent of earth's freshwater, with 30.1 percent found in groundwater. Only 1.2 percent of fresh water is exposed to the surface of the planet.Full Answer >
The answers to physical science questions can be found in textbooks, websites and from teachers. Because teachers rarely ask questions about material that has not been covered, textbook or class notes are the best place to start. However, if a review of class notes and textbooks fails to produce the desired answers, a trip to the library or an internet search is the next best option.Full Answer >