Review: Sea-Floor Spreading

Finding________ rocks at mid-ocean ridges is considered evidence for seafloor spreading.

• older
• younger
• denser

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Oceanic plates are pushed down into the upper mantle in _________ zones.

• subduction
• divergent
• convection

Tags

NGSS.MS-ESS2-3

New seafloor material is formed at places in Earth’s crust where

• rock is broken into pieces as tectonic plates push against each other.
• one tectonic plate slides beneath another and is forced downward.
• lava flow from volcanic eruptions builds up over many thousands of years.
• magma rises from a crack in the oceanic crust.

Tags

NGSS.MS-ESS2-1

Part of the recycling of seafloor material includes its destruction. This happens

• through weathering and erosion of exposed rock layers.
• as a result of violent and frequent volcanic activity.
• at trenches where rock material is subducted.
• when elements in rock are rearranged chemically.

Tags

NGSS.HS-ESS1-5

Examining rocks that form on either side of the Mid-Atlantic Ridge provides evidence that supports the idea of sea-floor spreading.

• have higher iron content.
• are made up of smaller particles.
• become thicker and thicker.
• are consistently older.

Tags

NGSS.MS-ESS2-3

An undersea mountain chain where new ocean is produced is called

• Deep-Ocean Trench
• Sea-Floor Spreading
• Mid-Ocean Ridge
• Continental Drift

Tags

NGSS.MS-ESS2-3

The process by which molten material adds new oceanic crust to the ocean floor is

• Deep-Ocean Trench
• Sea-Floor Spreading
• Mid-Ocean Ridge
• Subduction

Tags

NGSS.MS-ESS2-3

- A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle

• Mid-Ocean Ridge
• Sea-Floor Spreading
• Deep-Ocean Trench
• Subduction

Tags

NGSS.MS-ESS2-3

- A device that determines the distance of an object under water by recording echoes of sound waves

• Subduction
• Sonar
• Mid-Ocean Ridge
• Deep-Ocean Trench

Tags

NGSS.MS-PS4-2

- The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle

• Sonar
• Subduction
• Mid-Ocean Ridge
• Deep-Ocean Trench

Tags

NGSS.MS-ESS2-3