Which is the smallest thing in the universe?
Which is the smallest thing in the universe?
The electron is, as far as we know, one of the fundamental, indivisible building blocks of the universe. It was the first Standard Model particle ever discovered. Electrons are bound to an atom’s nucleus by electromagnetism.
What is the softest rock in the world?
talc
What is the softest fabric in the world?
More extraordinary than cashmere, the softest wool in the world comes from Vicuna, the national animal of Peru. A Vicuna is a more elegant relative of Llama, a 1.8 metre tall domesticated animal of South America.
Which is the hardest rock and softest rock?
Talc – Gypsum – Calcite – Fluorite – Apatite – Feldspar – Quartz – Topaz – Corundum – Diamond – “Mohs Scale of Mineral Hardness ” should be familiar to rock-hounds and earth-science students alike, as it lists common minerals in the order of relative hardness (talc as the softest and diamond as the hardest […]
What mineral is not scratched by a fingernail but is scratched by a copper penny?
Hardness
| mineral | Mohs hardness | observations on the minerals |
|---|---|---|
| talc | 1 | very easily scratched by the fingernail; has a greasy feel |
| gypsum | 2 | can be scratched by the fingernail |
| calcite | 3 | very easily scratched with a knife and just scratched with a copper coin |
| fluorite | 4 | very easily scratched with a knife but not as easily as calcite |
Is salt the only rock we eat?
Salt is probably the only mineral which is consumed purposefully in mineral form (as salt). A few people are known to eat some varieties of clay (which is a mineral), but it isn’t a necessary part of the human diet, and is typically eaten mostly to stave off starvation.
What is the only rock eaten by humans?
Salt