What acid does not melt plastic?

“Hydrofluoric acid won’t eat through plastic. It will, however, dissolve metal, rock, glass, ceramic. So there’s that.” Hydrofluoric acid (HF) is a solution of hydrogen fluoride in water.

Which is the most abundant metal in the earth’s crust?

Aluminum is the most abundant metallic element on the surface of the earth and moon; it composes more than eight percent of the earth’s crust. It is never free in nature, combining with oxygen, sand, iron and titanium; its ores are mainly bauxites (aluminum hydroxide).

What was the first US national monument?

President Theodore Roosevelt established the first national monument, Devils Tower in Wyoming, on September 24, 1906.

Which bone is located in the human skull?

With that in mind, as one possible classification, the human skull could for example be said to consist of twenty two bones: Eight bones of the neurocranium (occipital bone, 2 temporal bones, 2 parietal bones, sphenoid bone, ethmoid bone, frontal bone), and fourteen bones of the viscerocranium.

How long can a Nile crocodile hold its breath?

They normally dive for only a few minutes, but will stay underwater for up to 30 minutes if threatened, and if they remain inactive they can hold their breath for up to two hours.

How many calories are in a stamp?

Every time you lick a stamp, you’re consuming 1/10 of a calorie.

When was glass first made?

Archaeologists have found evidence of man-made glass which dates back to 4000 BC; this took the form of glazes used for coating stone beads. It was not until 1500 BC that the first hollow glass container was made by covering a sand core with a layer of molten glass.