Question

read the text. then answer the question.
clams, crustaceans, and fish lived in a sea near a coral reef. after these animals died, some of them sank to the bottom of the reef. their bodies became part of the sediment.
over time, the sea began to dry up. eventually, the area was no longer underwater. it became part of a beach. sand was deposited where the coral reef had once been.
as the sea level continued to fall, the area became part of a river valley. silt was deposited on top of the older layers of sediment.
a rock sequence formed from the sediment layers described above. put the following rocks in order to show what this rock sequence probably looked like.
younger
limestone
siltstone
sandstone

Explanation:

Step1: Match rocks to sediment sources

Limestone forms from coral/animal remains (reef sediment), sandstone from sand (beach), siltstone from silt (river valley).

Step2: Order by deposition time

Oldest layer: limestone (first sediment). Middle: sandstone (beach deposit). Youngest: siltstone (river valley silt).

Answer:

Youngest: siltstone
Middle: sandstone
Oldest: limestone

(Ordered from top to bottom as siltstone, sandstone, limestone)