Question

o compunere in engleza despre Hawaii despre ce iti place la el si ce ai face daca ai fi in Hawaii

Answer 1

Hawaii Beach Sand CompositionThere aren't many other places in the world where you can find such a variety of beaches as in the Hawaiian islands. Beaches in Hawaii can be composed of white, yellow, black, red or even green sand, as well as pebbles and rocks.Most beaches in the world are made up of the quartz mineral; others contain small rocks, coral or shell fragments, iron, small gemstones and other minerals. The Hawaiian islands are of volcanic origin, formed by undersea volcanoes. Since Hawaii does not have a continental source of quartz, the popular white beaches here are composed of the carbonate shells of marine organisms.The Hawaiian islands are surrounded by an extensive coral reef, which continuously grows as well as breaks down. The coral reef is built by marine animals, such as corals, and plants, such as algae, that live on the reefs. 

Corals are the main contributor to a reef's growth. A coral is a tiny animal referred to as a polyp. It has a hard shell that is composed of calcium carbonate, which it extracts from the substances of the ocean. A collection of matured hard coral is called a coral colony. Coralline plants, or calcareous algae, also contribute to a coral reef's growth. This algae grows on the coral heads and also uses calcium carbonate in the reef building process. Many other species, such as sponges and other algae, live on the coral reef that are part of this ecosystem.The reef breaks down into sand by two main factors – mechanical erosion and bioerosion. These two processes create some of the sand for Hawaii's beaches. Mechanical erosion is mainly waves and currents that erode the reef and break it down. Bioerosion is the breaking down of the reef structure into sediment by various marine animals.One such marine species that significantly contributes to bioerosion is the parrotfish. This fish species (there are about 90 species of parrotfish worldwide, known collectively as Scaridae) is named for their dentition. They have many teeth that form a parrot-like beak with which they scrape off algae and a variety of reef organisms and pieces of coral from the reef. They play an important role in making the coral reef grow because the algae they feed on would otherwise smother the coral. During the feeding process they grind up coral rock and ingest it. After the rock is digested, they excrete it as sand. One parrotfish can produce about 90 kg (198 lbs) of sand per year