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Question: 13 for clastic rocks the bigger the grains the more...

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13. For clastic rocks, the bigger the grains, the

More angular

Closer to the source

Less angular

Farther from the source

14. Cementation occurs as a result of

Precipitation of solids from groundwater

Precipitation of solids from surface water

Percolation of solids through pore spaces

Addition of siliceous microfossils to the sediment

15. A black shale with fossil ferns was probably created in which environment?

Beach

Deep marine basin

Low-energy terrestrial

Alluvial fan

16. Given that ions dissolved in surface water eventually end up in the sea, which of the following statements is likely true?

Seawater has become saltier over time

Seawater has become less salty over time

Seawater has not changed its composition over time

Seawater salinity is not controlled by input of dissolved ions but by evaporation

17. T/F: Evaporites form only in marine environments

True

False

18. The increase of atmospheric oxygen thought to have triggered precipitation of banded iron formations is attributable to

A giant meteorite impact about 2.5 billion years ago

An increase in global mafic magmatism about 2.5 billion years ago

The cumulative impact of photosynthetic organisms up til about 2.5 billion years ago

The increase in oceanic volume up til about 2.5 billion years ago

19. Chalk is a rock primarily composed of which mineral?

Calcite

Chert

Gypsum

Hematite

20. Coal is what category of sedimentary rock?

Clastic

Chemical

Biogenic

A combination of chemical and biogenic

21. Alluvial fans and river deltas have similar shapes but

Alluvial fans are not formed by flowing water

Alluvial fans have finer sediments

Alluvial fans have coarser sediments

Alluvial fans are only found on Mars

22. You find a rock which displays a surface with polygonal shapes associated with mudcracks. It is reasonable to assume that

The rock formed in the recent past

The rock formed on a beach

The rock formed in an environment that was subject to fluctuating wet and dry conditions

The rock formed in an environment that was subject to fluctuating hot and cold conditions

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