I am at my school right now,and I have a test next period,and I need to know this question. Please help.
2007-09-27 03:46:35 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Geography
They create it by extruding lava (it's called magma while it's still underground, and lava when it comes to the surface). This adds rock / land mass to the surface.
They can also destroy it when they explosively erupt, with lava flows, landslides, lahars, pyroclastic flows, etc.
2007-09-27 03:50:09 · answer #1 · answered by Anonymous · 2⤊ 0⤋
On the Big Island of Hawai'i the Kilauea volcano has been erupting continuously for the last 25 years, it has added about a square mile to the size of the island. All of the Hawaiian Islands have been created by volcanos. So has most of Japan. Yet volcanos can explode, too. The whole island of Santorini exploded about 3,000 years ago, it left just a deep spot in the ocean. So did Krakatoa in 1883 in Indonesia, but it has rebuilt. Mt. St. Helens exploded in 1980, it blew the top 3,000 ft. of its cone into dust. Volcanos are really interesting, I could go on for hours.
2007-09-27 03:52:02 · answer #2 · answered by jxt299 7 · 2⤊ 0⤋
about 20-30 years ago, a volcano made a new island off the coast of Iceland
a few weeks later the volcano erupted again and destroyed the new island
2007-09-27 05:14:20 · answer #3 · answered by rosie recipe 7 · 1⤊ 0⤋
Look in a book!
Anyways.. the Lava melts the land, and the magma under the ocean bubbles up and cools froming sand bars, which then a mangrove gets ahold of it, and pulls the dirt up forming an island!
2007-09-27 03:50:00 · answer #4 · answered by Melois Koro 3 · 0⤊ 3⤋
they create land by magma exiting the earth above sea level that is called lava ,like hawaii,they destroy it by violent eruptions they cause the material to go below sea level
2007-09-27 03:53:17 · answer #5 · answered by randall g 3 · 1⤊ 0⤋