Introduction to Plate Tectonics: The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
Igneous or magmatic rocks: The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.
Earthquake News: News in this category include: latest and archived earthquake lists & maps, reports, largest recent earthquakes, quakes near volcanoes, significant quakes etc - news and articles about earthquakes world-wide.
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