What are diatom test shells made of?

Answer Diatom tests (the hard shell of the diatom, sometimes called testa, or testae) are composed of almost pure silica. Silica is silicon dioxide, which is written chemically as SiO2. Marine botanists... Read More »

Top Q&A For: What are diatom test shells made of

What are mollusk shells made of?

While not all mollusks possess a shell (notable exceptions include squid, octopi and slugs), those that do secrete the shell from a specialized tissue called the mantle. The shell itself is a compo... Read More »

What are oyster shells made of?

Oyster shells are mostly of calcium carbonate, and because of this have extensive use on land for other purposes. People use oyster shells in gardens for the calcium carbonate, and feed them to bir... Read More »

In the poem She shells sea shells by the sea shore?

it's 'she sells sea shells by the sea shore', not 'she shells sea shells by the sea shore'.

Who made the I.Q. test?

The French scientist Alfred Binet was responsible for invention of the first modern intelligence test. In 1905, Binet, with the aide of his research assistant Theodore Simon, created a test for mea... Read More »