Which of the following are erosional coastline features (select all that apply)? a. sea cave b. sea stack c. sand spit d. wave-cut platform

Option (A), (B) and (D)

Explanation:

Sea caves are formed at the rocks located mostly along the shoreline due to the constant hitting of the sea waves on the rocks. Its is an erosional process.

Sea-stacks are the standing, steep rock bodies that are located near the coastal areas, formed due to the frequent erosion by wind as well as water waves.

Wave-cut platforms are the tapering, horizontal area that are often found along the coast line, formed due to the erosional process.

                  Whereas, sand spits are depositional features, formed off coasts due to the accumulation of the materials by the longshore drift.

Hence, sea caves, sea stacks and wave-cut platforms are erosional features but sand spit is a depositional feature.

Step-by-step explanation:

Let w represent the width of the floor. Then the length of the floor is (w+4) and its area is ...

  A = LW

  525 = (w+4)(w)

  w^2 +4w -525 = 0

  (w -21)(w +25) = 0 . . . . factor the above

Solutions are ...

  w = 21, w = -25

We are interested in the positive solution: w = 21.

The floor is 21 feet wide and 25 feet long.

Alternate solution

Sometimes, when the factors aren't obvious, it works well to write an equation for the average of the dimensions. Here, we can represent that with x, and use (x-2) for the width, and (x+2) for the length. Then we have ...

  525 = (x-2)(x+2) = x^2 -4

  529 = x^2

  √529 = 23 = x

Then w=23 -2 = 21, and the length is w+4 = 25.