Ocean Ridges and Trenches

submerged outer edge of the continent where continental crust transitions into oceanic crust.

• Mid-ocean ridges

• Mid-ocean ridges

• Abyssal plains and abyssal hills

• Continental margin

a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading

• Abyssal plains and abyssal hills

• Mid-ocean ridges

• Mid-ocean ridges

• Deep-ocean trenches

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

is an extremely flat, sediment-covered stretches of the ocean floor, interrupted by occasional volcanoes, mostly extinct, called seamounts.

• abyssal plain

• abyssal hills

are elongate hills, typically 50-300m high and common on the slopes of mid oceanic ridge.

• abyssal plain

• Abyssal hills

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

narrow, elongated depressions on the seafloor many of which are adjacent to arcs of island with active volcanoes; deepest features of the seafloor.

• Deep-ocean trenches

• Mid-ocean ridges

• Deep-ocean trenches

• Seamounts and volcanic islands

Tags

NGSS.MS-ESS2-3

submerged volcanoes

• Mid-ocean ridges

• Seamounts and volcanic islands

• Abyssal plains and abyssal hills

• Continental margin

Tags

NGSS.MS-ESS2-3

those that rise above the ocean surface These features may be isolated or found in clusters or chains.

• seamounts

• volcanic islands

consists primarily of basalt

• Distribution of seafloor topographic features

• Sediment thickness

• Composition of oceanic crust

distribution of mid-ocean ridges and depth of the seafloor

• Distribution of seafloor topographic features

• Sediment thickness

• Composition of oceanic crust

Tags

NGSS.MS-ESS2-3

fine layer of sediment covering much of the seafloor becomes progressively thicker away from mid-ocean ridge axis; seafloor sediment not as thick as previously thought

• Distribution of seafloor topographic features

• Sediment thickness

• Composition of oceanic crust

Tags

NGSS.MS-ESS2-3