13.2 Magnetic Field and Geological Time Quiz

Device that can detect small changes in magnetic fields

• Magnetometer

• Isochron

• Iron

• New ocean crust

Minerals containing this act like small compass needles and record the orientation of Earth’s magnetic field at the time of their formation

• Geomagnetic time scale

• Iron

• Isochron

• Magnetometer

Was constructed from data gathered from continental basalt flows

• New ocean crust

• Magnetometer

• Geomagnetic time scale

• Iron

This type of line connects points on a map that have the same age

• Isochron

• Iron

• Magnetometer

• New ocean crust

Each cycle of spreading and magma intrusion along an ocean ridge results in the formation of this

• Geomagnetic time scale

• New ocean crust

• Isochron

• Magnetometer

This type of line connects points on a map that have the same age.

• Contour line

• Isochron

• Latitude

• Longitude

Each cycle of spreading and magma intrusion along an ocean ridge results in the formation of this.

• Old ocean crust

• New ocean crust

• Mountain ranges

• Deep-sea trenches

Sonar uses sound waves to measure water depth.

• True

• False

Maps made from sonar and magnetometer data led to the discovery of ocean ridges and deep-sea trenches.

• True

• False

Rock samples taken near ocean ridges are older than rock samples taken near deep-sea trenches.

• True

• False