March 1964 - biggest earthquake in North America. Damage to Fourth Avenue, in Anchorage, Alaska, caused by the Good Friday Earthquake. Collapse of Fourth Avenue near C Street due to a landslide caused by the earthquake. Image via Wikimedia Commons.
How Volcanos Work The majority of Earth’s volcanoes are found on the seafloor, along the mid-ocean ridge — a chain of volcanic peaks that rings the planet and the spot where many of Earth’s plates spread apart. (image: USGS) (via:OurAmazingPlanet)