Module 6 - Seafloor Spreading

Which of the following supports the theory of seafloor spreading?

• Correlation of rock layers

• Continuous mountain chains

• Crustal age

• Magnetic reversal

Tags

NGSS.MS-ESS2-3

Why were magnetic patterns found on the ocean floor puzzling?

• All rocks were magnetic

• They showed alternating bands of normal and reversed polarity

• No rocks were magnetic

• They did not show alternating bands of normal and reversed polarity

How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

• By mapping rocks on the sea floor using sonar

• By determining the age of rock samples obtained by drilling on the sea floor

• By observing eruptions of molten materials on the sea floor

• By measuring how fast sea floor spreading occurs

Tags

NGSS.MS-ESS1-4

What does scientist thought about the seafloor before they had data from echo sounders?

• The seafloor is broken up by trenches

• The seafloor is steeply sloping

• The seafloor is completely flat

• The seafloor is covered with ridges

What features of seafloor mountain ranges on the ocean floor upwells magma and formed new ocean floor?

• Mid-ocean ridge

• Continental slope

• Abyssal plain

• Trench

Tags

NGSS.MS-ESS2-3

What technology did scientist used in the mid-1900s to map the mid-ocean ridge?

• Magnetometer

• Deep sea diving

• Sonar

• Submarine

Tags

NGSS.MS-PS4-2

Which of the following is not included in the group?

• Magnetic strip

• Mid-ocean ridge

• Drilling sample

• Molten materials

Tags

NGSS.MS-ESS2-3

What feature of seafloor is described as the deepest areas of the ocean where subduction takes place?

• Continental slope

• Mid-ocean ridge

• Trench

• Abyssal plain

Tags

NGSS.MS-ESS2-3

What indicators were observed by geologist to conclude that the polarity is reversed?

• The north and south are aligned as they are now

• The north and south are in opposite direction

• The north and south are in same direction

• The north and south are at the center

Tags

NGSS.HS-PS2-5

Which scientist from the 1960s is credited for proposing the theory of seafloor spreading?

• Harry Hess

• Charles Darwin

• Alfred Wegener

• Albert Einstein

Tags

NGSS.MS-ESS2-3