What is sea floor spreading?

- sea floor spreading is the process in which one ocean floor is extended when two plates move apart, As plates move apart, the rocks break and forma a crack between the plates. Earthquakes occur along the plate boundary; magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano.

What are some of the major land forms that are created from plate movement?

-plate movement created seven the big major land on the earth, they are Asia, Africa, north America, south America, Antarctica, Europe and Australia. The plate movement also creates different Small Island just like Saipan and Guam. Also, plate movement also created volcanoes, mountains and trenches.

How were the Mariana Islands formed?

Mariana Island consists of Northern part of Agrihan, Anatahan, Alamagan, and Pagan are inhabited, and Southern part are Rota，Guam Aguijan， tianian and Saipan , all the Mariana Island are was formed by the volcanoes created from the plate movement long time ago. Although some place of this island already inhabited but a few of these volcanoes still sometimes erupt.

What evidence exists today that the plates are still moving and that the islands are ancient volcanoes?

There are still unknown island recently find by the people and also there are still many movement like Earthquakes are always appear in Japan and sometimes in Saipan. The other example can be the volcanoes erupt or the tsunami in 2004 in Indian.

What is an atoll?

Considered one of the most beautiful of formations to be found in warm waters, the atoll is basically an island that it constructed of coral and encircles a lagoon. Found most often in tropical sections of the Pacific and Indian oceans, atolls are noted for creating an attractive and peaceful setting.

Why are atolls mainly found on the Pacific?

Atolls are the product of the growth of tropical marine organisms, so these islands are only found in warm tropical waters. Volcanic islands located beyond the warm water temperature requirements of reef building (hermatypic) organisms become seamounts as they subside and are eroded away at the surface. Pacific Ocean is the good environment for atolls , so that’s why many atolls are can find there.