The sediment in this photograph most likely formed in a) a steep mountain front

Question

The sediment in this photograph most likely formed in a) a steep mountain front b) a river c) a sand dune 21. What type of plate boundary is depicted in this figure? a) oceanic divergent d) deep water conditions on the b) ocean-ocean c) ocean-continent d) continental collision e) transform boundary boundary 19. What order did the rock layers and features form in this photograph (listed from oldest to youngest)? a) upper layer, fracture, middle 22. Identify the list that consists of ten b) lowest layer, middle layers, c) lower layer, middle layers, d) layers, lowest layer fracture, upper layer upper layer, fracture common minerals ranked in order of increasing hardness, from 1 to 10 a) Mohs Hardness Scale b) Bowen's reaction series c) Breakage chart d) Specific gravity scale none of these 23. This figure shows plate boundaries south of Alaska. Which location is on a transform boundary? a) 1 b) 2 c) 3 d) 4 c) 2 and 3 Upper layer Fracture Middle layers Lowest layer 20. How did the Red Sea, shown between Arabia and Africa in this figure, form? a) subduction of Arabia beneath Africa b) subduction of Africa beneath Arabia c) a continental collision d) continental rifting followed by seafloor spreading e) transform faulting followed by a continental collision

Explanation / Answer

18) The sediment in this photograph most likely formed in a steep mountain front.

Sediments are transported only when there is enough energy in the transporting medium, for example, when a stream is flowing rapidly enough to carry a given size of sedimentary particle. Steep mountain streams can move large boulders during spring flood but these boulders will never be transported out into a placid lowland river. So the largest sediments (boulders, cobbles, and pebbles) which survive the weathering process, tend to be deposited near to their source, for example at the point where a mountain stream flows out onto a valley floor.

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