Hawaii, USA was formed because of volcanic eruptions.

Hawaii State (Hawaii) is the only archipelagic state in the United States, consisting of 132 islands in the central Pacific Ocean. The capital is located in Honolulu (Honolulu) on the island of Oahu. The Hawaiian Islands were formed by volcanic eruptions and consist of 8 large islands and 124 small islands stretching 2,450 kilometers in a crescent-shaped island chain. The earliest inhabitants were Polynesians, and after 1778, European and Asian immigrants came to Hawaii, where the Kingdom of Hawaii was established in 1795, annexed by the United States in 1898, and returned to the United States in 1900.

Hawaii Island is the largest island, there are two active volcanoes on the island. The climate is mild and pleasant all year round, and the precipitation is greatly affected by the terrain, which varies greatly from place to place, with a forest cover of nearly 50%. The state is made up of nineteen major islands and coral reefs and is located in the central Pacific Ocean.

Hawaii's Economy

The major industries of the state include tourism, defense industry, and agriculture. Pearl Harbor on the south shore of Oahu is the largest U.S. military port within the Pacific Ocean; Honolulu, the state capital, is the center of commerce and industry in the state of Hawaii. Agriculture is the mainstay of the local economy, producing sugarcane, pineapples, coffee, bananas, and so on. Hawaii is suitable for the growth of sugar cane.

The islands 2 / 3 of the land planted sugar cane, annual production of about 1 million tons of crude sugar. This is equivalent to 10% of the total annual consumption of sugar in the United States, and is therefore known as the sugar island of the United States. Industry is dominated by the food processing industry, and there are a few oil refineries, chemicals, cement and so on. Food and major industrial products are dependent on imports. Due to the pleasant climate and charming scenery, tourism is very developed, with an annual average of more than 7 million visitors, Oahu is a concentrated area of tourism.

Reference for the above: Baidu Encyclopedia-Hawaii