Earth's Core

	Imagine that you are monitoring a seismograph and an earthquake occurs somewhere. The first P waves arrive at 4:30 in the afternoon, and the first S waves arrive 8 minutes later. How far away is the earthquake epicenter?
	1: About 160 miles away. 2: About 326 miles away. 3: You cannot tell from this information. 4: P and S waves are useful for intensity only, not distance. ANSWER: Click here for the correct answer.

	Probing the Earth's interior is a bit like sonar, which is used to locate submarines and other underwater objects. Sonar utilizes acoustic waves. Which type of seismic wave would these be related to?
	1: The waves used in sonar are like S waves. 2: The waves used in sonar are like P waves. 3: There is no analogy between sonar waves and seismic waves. 4: The sonar waves are electromagnetic, like radar waves. ANSWER: Click here for the correct answer.

	Would a seismograph on the surface of Jupiter measure "Jupiter-quakes?"
	1: Yes 2: No 3: No, it is too cold 4: This is a trick question. ANSWER: Click here for the correct answer.

	Have scientists discovered moonquakes' on the Moon?
	1: No 2: Yes. 3: Maybe. Astronomers have been able to detect what may be 'moonquakes' through telescopes. 4: This information cannot be obtained. ANSWER: Click here for the correct answer.