Quiz 2.2 Weathering, Erosion, and Sedimentation

What forms at the mouth of rivers that carry large amounts of silt and clay?

• tombolo
• delta
• sea stacks
• headlands

Which is the largest particle size?

• sand
• clay
• silt

How was the formation represented by the letter B created?

• sedimentation built the sea stack
• surrounding erosion left the sea stack standing alone

Which has overall higher levels of erosion than it does sedimentation?

• rocky coast
• sandy coast

Choose the answer that provides examples of biological (or organic) weathering

• Frost wedging, in which ice in cracks of the rocks freezes
• Dissolving of calcite by carbonic acid
• Rock boring urchins biting chunks of rocks in the intertidal zone

The diagram below shows a cliff along a coastline that has cracks. When water seeps into these cracks and then freezes, the cracks widen. Which type of weathering is this?

• chemical
• physical
• biological

Which of the following is NOT true of depositional coasts?

• there is more sedimentation occurring than weathering
• they are constantly changing and shifting
• particles are only sand sized or larger
• all Florida beaches are depositional coastlines

Which mixture of particles sizes on the beach would result in the clearest water along the beach?

• 90 % sand, 10% silt, and 0% clay
• 60% sand, 30% silt, and 10% clay
• 10% sand, 70% silt, and 20% clay

Along which type of coastline do you find estuaries, barrier islands, and sand bars?

• erosional
• depositional

Why do estuaries often have high turbidity (water that is murky, non-clear)?

• the sediment contains a lot of large sand particles that sink quickly
• the sediment contains a lot of small, fine particles that are easily stirred up