Rocks On The Ocean Floor Are All
The island that we know today as hawaii is thought to be between 300 000 and 600 000 years old.
Rocks on the ocean floor are all. So every time when there is a volcanic eruption at the same time after that there will be formed igneous rocks. The volcanic cone grew as recurrent eruptions built up layer after layer of basalt flows. New rock is formed by magma at the mid ocean ridges and the ocean floor spreads out from this point. For example the mid atlantic ridge runs roughly north and south along the entire length of the atlantic ocean from iceland all the way to antarctica and forms the plate boundary for the adjacent.
This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level. The following features are shown at example depths to scale though each feature has a considerable range at which it may occur. Igneous rocks is formed from the molten volcanoes that is already cold and also magma or lava that came from the mid ocean ridges. A symmetrical pattern of positive and negative magnetic lines emanates from the mid ocean ridge.
And they believe that similar tiny clay filled cracks. Thus an analysis of the rock types comprising the ocean floor should best begin where ocean floor itself begins along the mid ocean ridges. All of the islands in the hawaiian island chain were built up from basalt eruptions on the sea floor. It began as an eruption on the floor of the pacific ocean.
The first types of rocks on ocean floor we have is igneous rocks.