23 - Which of the following features would you not expect at an active continent

Question

23 - Which of the following features would you not expect at an active continental margin? A - a broad continental shelf B - sedimentation in a trench C- subduction D -a benioff zone 24 The transitional zone between the outer edge of the continental shelf and the deep ocean is the A continental flat B- continental slope C-Benioff zone D -abyssal plane 25 - As young sea floor moves away from a spreading ridge, A - it becomes more brittle and more seismically active B - it cools and contracts, so the sea floor slopes away from the ridges C-it sinks deeper into the asthenosphere and starts to melt D- it breaks up to form abyssal hills 26 A large, flat- topped submerged hill rising from the sea floor is A - a shield volcano B - a seamount C- an abyssal hill D- a guyot 27 Oceanic plateaus A - may have a crustal structure like that of continental crust B- are formed by subduction C-have a volcanic origin D- are created at seafloor- spreading ridges 28 - The rock of sea floor (layer 2) are A - salt B-carbonate ( limestone) C -basalt D - ultramafic

Explanation / Answer

23) broad continental shelf

in an active continental margin the continental shelf is narrow, these margins are tectonically active, eg:west coast of south america

24)continental slope

this region begins after the continental break where the shelf region end, and the slope region extend towards the deep ocean floor.

25) it cools and contracts so the sea floor slopes away from the ridges.

as the distance from the ridge axis increases, the plate becomes cooler and more denser.

26) a guyot

guot is a eroded sea mount and its top appears to be flat

27)are created at seafloor spreading ridges.

when two plates diverges each other, magma uwells and form new oceanic crust.

28) basalt

sea floor mainly layer to is made of basalt, it is a fine grained igneous rock.

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