sedimentary rocks continued

water

ripple marks suggest that the area was once covered with ____

sand

second largest sediment size, particles can range in size (coarse vs fine)

silt

second smallest sediment size, the eye can just barely see the largest crystals

conglomerate, breccia

some examples of rocks composed of gravel size sediments include ____ & ____

quartz sandstone, arkose

some examples of rocks composed of sand sized sediments include ____ & ____

siltstone

one example of a rock with silt sized sediment is ____

true

(t/f) mud cracks suggest that the area used to be wet but dried out over time (such as a ancient flood plain)

true

(t/f) sedimentary rocks preserve clues about the environment in the past

ripple marks

Small waves of sediment formed by moving water or blowing wind

clay

Smallest sediment size

fissle

Splits easily into sheets (shale)

fossils

The preserved remains or traces of organisms in the rock layer that once lived on Earth

cementation

The process in which minerals precipitate into pore spaces between sediment grains and bind sediments together to form rock.

lithification

The process through which sediments turns into rocks after being buried

mudstone

____ could be considered to have silt or clay sized sediments

clasts

broken pieces of rock

paleocurrents

flow direction of ancient currents

gravel

largest sediment size

bedding

layering visible in rocks that results from the settling of particles during deposition

mud cracks

mud dries up and cracks into polygon-like shapes, the sediments then lithify, leaving behind rock with a unique pattern

claystone

one example of a rock with clay sized sediments is ____

wavy

symmetric ripple marks suggest that the water was ____

crossbedding

the pattern in rocks left by water and wind blown sediment

compaction

the process by which sediments are pressed together under their own weight, reducing the pore spaces between them