Crystals TedEd Talk

What elements make up the mineral galena?

• Silicon and oxygen

• Potassium, aluminum, silicon, and oxygen

• Potassium, aluminum, silicon, and oxygen

• Lead and sulfur

How are the atoms generally arranged in crystals?

• Randomly

• Always in a highly organized, repeating way

• Always in a double helix

• Scientists have not figured this out yet

What geometric shape does quartz form when it grows as a perfect crystal?

• A six-sided column with pointed tips

• A cube

• An octohedron

• Quartz never grows as a geometric shape

Why does glass have a random arrangement of atoms?

• The elements that make up glass does not allow its atoms to be arranged in an highly organized, repeating way

• The random atomic arrangement of the liquid glass is locked in with fast cooling

• The random atomic arrangement of the liquid glass is locked in with quick cooling

• Because it wasn’t made by a volcano

What is one important requirement listed below that help allows a growing crystal to form a geometric shape?

• The crystal must contain silicon and oxygen

• There must be open space for the crystal to grow into

• Space must be limited for the growing crystal

• The crystal must grow rapidly

What is origin of the shapes of diamond found in jewelry?

• The diamond is cut into the shapes seen

• The diamond must have grown in the earth’s mantle

• The diamond must have grown in the presence of germanium

• The diamond must have grown at very high pressure