12. In an arid climate which of the following rocks would form a cliff if eroded
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Question
12. In an arid climate which of the following rocks would form a cliff if eroded by a stream: a) shale c) sandstone d) limestone e) c) and d) b) evaporate 13. When would you expect the most falling debris on mountain roads in the Colorado? a) hottest week of summer b) the wettest week of spring d) the week you drive through the mountains c) coldest week of winter 14. Cross bedding in sandstone indicates: a) sand deposition by glaciers c) sand deposition in a swamp b) sand deposition in a current d) rapid sand deposition 15. Mud-cracks in a mudstone indicate that the mud was deposited; a) offshore in an ocean basin b) in the deep part of a lake c) on a flood plaine) on the moon d) on the abyssal plairn 16. Which of the following would carry the most sediment? a) the White River at low flow b) a mountain stream at normal flow d)100 b c) the Mississippi river near flood stage oy scouts with 5 gal buckets of sandExplanation / Answer
12: Sandstones will form a cliff because sandstones contains majority of quartz whose hardness is around 7 according to Mohs hardness scale whereas shale & limestones contain calcite whose hardness is 3 & evaporates whose harness lies between 2-3.
13: Most falling debris will occur during the wettest week of spring because there will be sufficient moisture present responsible for triggering debris flow & also there will be no green vegetation cover which holds the debris flow.
14: Sand deposition in a current as the cross-beds reflect the steep faces of ripples and dunes. These steep faces tilt down-current and thus indicate current flow direction.
15: Mudcracks (also known as desiccation cracks or mud cracks) are sedimentary structures formed as muddy sediment dries and contractsSo, the option is on a flood plain" because the sediments gets dry up when the water supply in the river becomes low but in all other cases like ocean basin, abyssal plain, deep part of lake the sediments don't get dry and on moon there is no water discovered till date.
16. A mountain stream at normal flow would carry the most sediments because the slope is high which is responsible for high load & energy in the stream is also high when the river is young which can easily wash out the sediments.
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