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What are 5 types of rocks?

  • Igneous Rocks.
  • Sedimentary Rocks.
  • Metamorphic Rocks.

What is the hardest natural substance in the world?

While diamonds may be the hardest naturally occurring substance found on earth, he explains, they are not the hardest available (there are two harder substances – a laboratory synthetic nanomaterial called wurtzite boron nitride and a substance found in meteorites called lonsdaleite).

What is the rarest element?

A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron affinity of the chemical element astatine, the rarest naturally occurring element on Earth.

Which is the hardest part in the human body?

Tooth enamel is the first line of defense your teeth have against plaque and cavities. It is the white, visible part of the tooth and it is also the hardest part of the human body.

Which part of tooth is the hardest?

Tooth enamel is the hardest substance in the body. The shiny, white enamel that covers your teeth is even stronger than bone. This resilient surface is 96 percent mineral, the highest percentage of any tissue in your body – making it durable and damage-resistant.

What is the strongest thing in the human body?

The strongest muscle based on its weight is the masseter. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars.

Which is the hardest part in the human body * 1 point?

In fact, the most durable and tough substance in your body is actually a tissue. Encasing your teeth and helping you chew, bite, and tear your food is your tooth enamel. That’s the hardest substance in the human body. Keep reading to learn more about enamel and other strong elements in your body.

What is the weakest muscle in your body?

stapedius

What is the weakest bone in your body?

The stapes is the smallest and lightest bone in the human body, and is so-called because of its resemblance to a stirrup (Latin: Stapes)….

Stapes
FMA 52751
Anatomical terms of bone