This diagram shows evidence for seafloor spreading.
Click on image for full size
D. Roddy and LPI
Pacific Rim of Fire
The diagram shows a remarkable fact about the surface of the Earth. Around the rim of the Pacific Ocean are many volcanoes. The rim of the Pacific Ocean also is the scene of much earthquake activity.
The ring of volcanoes around the Pacific Ocean is called the "Pacific Rim of Fire".
The diagram shown here also shows (in yellow) the boundaries of many of the Earth's surface plates.
You might also be interested in:
Many forces change the surface of the Earth over time. The largest force that changes our planet's surface is movement of Earth's outer layer in a process called plate tectonics. As shown in this picture,...more
A new robot called Nereus has dived deeper than any submarine before to the Mariana Trench, the deepest part of the ocean and where two of the Earth's tectonic plates intersect. The depth Nereus reached...more
Ash is formed as a volcano erupts when rocks made by the volcano blow apart into millions of tiny pieces. The rocks are still very hot, because they just formed from lava. If the hot rocks come into contact...more
Cinder cones are simple volcanoes which have a cone shape and are not very big. Compare the size of this volcano to the strato-volcano in this image. They are usually made of piles of lava, not ash. During...more
Lava can move in two ways, wide flat lava flows, or through channels which squeeze the lava into a small area. The fastest lava flows move at about 6 mi/hr, an easy jog, but they average between 2/3 and...more
Plates at our planet’s surface move because heat in the Earth’s core causes molten rock in the mantle layer to flow. We used to think the Earth’s plates just surfed on top of the moving mantle, but now...more
Many kinds of surface features are clues to a sliding lithosphere. Two types of features can form when plates move apart. At ocean ridges, the crust splits apart to make room for molten mantle rock. Continental...more