Sedimentation

A delta at the mouth of a river is the direct result of 

• runoff from sewage
• deposition of sediment
• an ancient glacier that passed through
• an underground river flowing to the ocean

Which particles will remain suspended in water for the longest time?

• pebbles

• silt

• clay

• sand

The sediment deposited in each bed is best described as

• sorted mainly according to particle shape
• a mixture of sorted and unsorted particles
• sorted mainly according to particle size
• showing no evidence of sorting

Which kind of sediment would probably be deposited farthest out in the lake?

• silt
• sand
• clay
• pebbles

When a stream flows into a lake, in what order are sediments deposited?

• clay, silt, sand then pebbles
• sand, silt, clay then pebbles
• pebbles, clay, silt then sand
• pebbles, sand, silt then clay

How does size affect the settling rate of a particle in water?

• As size increases, settling rate increases.
• As size increases, settling rate decreases.
• Size does not affect settling rate.

How does angularity affect the settling rate of a particle in water? (more angular = less round)

• As angularity increases, settling rate increases.

• As angularity increases, settling rate decreases.

• Angularity does not affect settling rate.

How does density affect the settling rate of a particle in water?

• As density increases, settling rate increases.
• As density increases, settling rate decreases.
• Density does not affect settling rate.

What kind of sorting is this?

• Vertical
• Horizontal
• Cross-bedding
• Unsorted

Which choice describes the arrangement of sediments where a river enters the ocean?

• Larger sediments near the mouth of the river, smaller sediments further away.
• Smaller sediments near the mouth of the river, larger sediments further away.
• Unsorted sediments