Pallasites are believed to have formed at the core/mantle boundary of large asteroids and are among the most sought after of meteorite collectibles. Imilac is a particularly stable pallasite and examples such as this one, with clear and colorful crystals, are highly prized by collectors. ...
Andes:Formed by the subduction of the Nazca plate beneath the South American plate, the Andes are a volcanic range with active volcanoes along the subduction zone. Appalachians:An older range in North America, formed about 480 million years ago, the Appalachian mountains display a folded structure...
Volcanoes, and even mountains, don’t have a perfect pointed cone shape. Most of them have ridges and bumps on the surface, so that’s exactly what we’ll be drawing in this step. Draw multiple straight lines at the bottom of the volcano. This creates the ridges surrounding the base of...
One idea is that volcanoes in what is now India experienced massive eruptions just before the end of the Cretaceous. These eruptions filled the air with carbon dioxide and sulfur, changing the climate and damaging plant and animal life. The changing face of the planet may have also played a ...
Volcanoes are classified as dormant, active, and extinct. One of the most active volcanoes today is in Mauna Loa, Hawaii. Is it magma or lava? Well, it’s both! Magma is the liquid rock inside the volcano, and once it spills out of it, it is called lava. Lava will burn everything...
These two layers are very deep within Earth, separated from its crust by the thick mantle. The mantle is solid but malleable, like plastic, and it's the source of the magma that comes from volcanoes. Earth's inner core spins, much like Earth spins on its axis. The outer core spins ...
4. True or false: Geodes and agates are formed in the same way. False. Agates develop as successive deposits of silica precipitate out of groundwater, filling the cavity completely. In contrast, geodes form when the mineral deposits do not completely fill the cavity. Learn More: What Are Ge...
So what happens to the magma formed by these processes? We saw that the magma produced at ocean ridges just hardens to form new crust material, and so doesn't produce spewing land volcanoes. There are a few continental ridge areas, where the magma does spew out onto land; but most land...
Supervolcanoes are what people mean when they say thatWyoming has a terrible secret located beneath YellowstonePark, whose caldera last erupted roughly 630,000 years ago and was 1,000 times more potent than the 1980 St. Helens eruption that laid waste to hundreds of square miles. Rare though ...
You can walk through at your own pace and will take you anywhere between 30 and 90 minutes but you get an insight into the Galapagos Islands, yes ALL of it: How they were formed, where the volcanoes are, the differences between the famous Darwin finches (fun fact, he didn’t study the...