Virginia Earth Science Magnetic polarity

The age of igneous ocean materials and the reversal of magnetic polarity are 2 major pieces of evidence that:

• Volcanoes are about to erupt

• Sea floor is spreading

• An earthquake is about to occur

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

What is inside the basaltic rock in the ocean's crust that is attracted to the Earth's magnetic poles?

• Pyromite

• Magnetite

• Quartz

Which is the older of the igneous material at the mid-ocean ridges:

• along the center of the ridge

• further away from the ridge

Tags

NGSS.MS-ESS1-4

What can be determined by radioactive dating of rocks

• The age

• The luster

• The hardness

Tags

NGSS.MS-ESS1-4

The strips of igneous rocks (​ (a)   ) rock which lie parallel to the mid-ocean ridges show match patterns of ​ (b)   reversals.

When the basaltic magma flows up in the middle of the ridge and begins to cool, crystals of magnetic minerals ​ (c)   themselves with the Earth's magnetic ​ (d)   like tiny ​ (e)   needles.

• basaltic
• magnetic
• align
• field
• compass

The igneous rocks (basaltic) rocks act like _____________ in the earth's crust.

• radiometer

• Thermometer

• Compass

Tags

NGSS.MS-ESS2-1

How do scientist know that the Earth's magnetic fields have reversed over time?

• The basaltic rocks near and far from the mid-ocean ridge point in the same direction

• The basaltic rocks near and far from the mid-ocean ridge point in the opposite direction