Sea-Floor Spreading

_______ are mountain chains on the ocean floor.

• Sea-floor ridges

• Mid-ocean ridges

• Tectonic plates

• Photosynthesis

Tags

NGSS.HS-ESS2-1

NGSS.HS-ESS1-5

Mid-ocean ridges are the sites of intense _________ activity.

• emotional

• volcanic

• earthquake

• mathematical

Tags

NGSS.HS-ESS2-1

NGSS.HS-ESS1-5

At a mid-ocean ridge, melted rock rises through cracks in the _________.

• ceiling

• river

• inner core

• sea floor

Tags

NGSS.HS-ESS2-1

NGSS.HS-ESS1-5

NGSS.HS-ESS2-3

As the melted rock cools and hardens,

it forms new ________.

• volcanoes

• hope

• core

• crust

Tags

NGSS.HS-ESS2-1

___________ is the process by which

new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge.

• Continental drift

• Sea-floor spreading

• Plate tectonics

• Mid-ocean range

Tags

NGSS.HS-ESS2-1

NGSS.HS-ESS1-5

___________ is the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.

• Continental drift

• Sea-floor spreading

• Plate tectonics

• Mid-ocean range

Tags

NGSS.HS-ESS1-5

In the 1960s, scientists studying the ocean floor discovered _____________.

• that the ocean floor had magnetic patterns

• the Titanic

• that the ocean floor had magical properties

• that the ocean floor was as smooth as a desert

Tags

NGSS.MS-ESS2-3

Throughout Earth's history, the north and the south magnetic poles have switched places many times.

• true

• false

Magnetic reversal is the process by which ________________.

• the Earth's north and south magnetic poles periodically change places

• the continents once formed a single landmass, broke up, and drifted to their present locations

• new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge

Tags

NGSS.HS-ESS2-1

NGSS.HS-ESS1-5

During times of normal polarity, such as today, a compass needle points toward the North Pole.

• true

• false

Tags

NGSS.HS-PS2-5