What is the innermost layer of the earth called?

What is the outermost layer of the Earth called? 

Rocks can come in many types, but they are all made up of small _____________

Which of these are examples of human-made rocks?

Which of the following is not a natural rock?

How many bones are there in an adult human body?

What is the scientific name for the thigh bone?

What part of your skeleton protects your brain and eyes?

The collection of bones that makes up the human body is called a _________

Which type of joint is found where your femur meets your hip bone?

What type of joint is found at your elbows and your knee joints?