Seafloor Spreading Activity

What do basalt magmas contain that aligns with Earth's magnetic field?

• Molten gold

• Molten iron

• Molten silver

• Molten copper

Tags

NGSS.MS-PS1-1

How many times has the Earth's magnetic field reversed during the past four million years?

• Eleven times

• Nine times

• Seven times

• Five times

Approximately when did the current interval of normal polarity begin?

• 600,000 years ago

• 500,000 years ago

• 800,000 years ago

• 700,000 years ago

Why are the magnetic stripes on the sea floor parallel to and symmetrical across the mid-ocean ridge?

• Because new crust forms and spreads away from the ridge

• Due to the Earth's rotation

• Because of ocean currents

• Due to wind patterns

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

What is a potential risk of mining on the Mid-Atlantic Ridge?

• Lack of minerals

• Geological instability

• Too close to land

• No marine life

Tags

NGSS.MS-ESS3-2

NGSS.MS-ESS3-4