volcanoes are formed when tectonic plates move under one another. generally, a massive plate moves under or subducts a denser continental plate. molten rock, gases and ash are released from the opening created by the activity between the responsible tectonic plates. hot molten magma solidifies ...
How are cinder cones (volcanoes) formed from a build-up of gases? How does a sedimentary rock turn into a metamorphic rock? How can the sun burn with no oxygen in space? Explain how ionic radii are obtained from known distances between nuclei in crystals. ...
There are a startling number of volcanoes on earth -- more than 500 "active" volcanoes in the world, about as many "dormant" volcanoes, and many volcanoes that have been deemed "extinct." As it turns out, these determinations are largely based on subjective interpretation or somewhat arbitrary...
Volcanoes are nature's way of bringing material from deep within the earth up to the surface. Melting processes within themantle– the interior part of the Earth between the super-heated core and the thin outer crust—produce magma which rises up hundreds of kilometers and eventually erupts on...
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...
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 ...
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...
Are you ready to learn how to plan a travel budget? Here are seven simple steps to follow to budget solo travel effectively. 1. Plan your itinerary.In order to successfully budget for your trip, you'll want to plan your itinerary first so you can accurately budget your expenses. For shor...
(literally), left over from the time when volcanoes hurled it into the atmosphere several billion years ago. By contrast, oxygen (both in O2and O3,or ozone, molecules) and the other elements in air are vital to life. Furthermore, oxygen is one of two elements, along wi...
There are 293 confirmed moons in our cosmic neighborhood. By studying these worlds, astronomers hope to learn about ancient asteroid collisions, space volcanoes, and the origins of life itself.