Topic Details (Notes format)

Which part of the ocean floor is a long, steep-sided depression, usually deeper than 6,000 meters?

Which part of the tooth is visible above the gum line, covered by enamel?

Which element has the chemical symbol "Bi"?

What is the basic unit of life?

What is the hardest natural substance on Earth?

In which European city is the Van Gogh Museum located?

Which landlocked Himalayan country is located between India and China?

Which is the largest freshwater lake by volume in North America?

Which vitamin is known as ascorbic acid?

Who discovered Piltdown Man?