Ready to think

  SALT MEADOWS Salt meadows are areas at the sea coast that are not flooded daily by sea water like tidelands or the beaches. They are flooded only by the high tide at regular intervals. The soil in these areas contains salt and is poorly ventilated; therefore, only a few plants can survive. Plants having an affinity for salt, like the beach lilac and the beach ester, grow here. Since the meadows have resistant stalks and leave to withstand the forces of the wind and the sea.

  About 550 million years ago, a lot of changes took place on place on Earth. At the time, probably the whole of the earth warmed up. As a result, a lot of ice melted and the sea level rose. It is assumed that the composition of the seawater became calciferous, turning mollusks that lived earlier in the sea into animals with hard protective calcium shells or calcium skeletons. From that time onwards many animals started turning into fossils after death. The first such animals were the trilobites, and these were later followed by the mussels and amenities, related to the octopus.