Helens erupted in 1980, it blew away the top 1,300 feet (400 m) of the mountain — about the height of the Empire State Building. ts can use their trunk like a snorkel in the water. Everything you need to know about volcanoes How do volcanoes form? Earth's top layer, the crust,...
A florist's guide to all things flowers, The Bouqs Company Blog is all about flower care, DIY floral projects, holiday gift ideas, and more.
Scientists have applied the full battery of modern instrumentation to studying Earth in ways that have not yet been possible for the other planets; thus, much more is known about its structure andcomposition. This detailed knowledge, in turn, provides deeper insight into the mechanisms by which ...
Rivers running westwardacquiredtremendous erosive power. Following fracture lines marking weaknesses in the Earth’s crust, they dug out gorges and canyons that knifed deep into the jagged coast. To the east the land sloped more gently, and broader valleys were formed. During repeated periods of ...
it is one of the oldest and most stable parts of the Earth’s crust. Its surface formations and soils were altered by the receding glaciers of thePleistocene Epoch(about 2,600,000 to 11,700 years ago). Lakes dot the fairly flat landscape, and thousands of islands form archipelagoes along...
Australia is the smallest continent and one of the largest countries on Earth, lying between the Pacific and Indian oceans in the Southern Hemisphere. Its capital city is Canberra, and its most important economic and cultural centers are Sydney and Melbo
bounded to the northeast by a series ofoceanic troughsand to the northwest by troughs, a chain ofcoral reefs, and a series of submarine ridges. The third major unit of the Earth’s crust in Indonesia is an extension of the belt of mountains that formsJapanand thePhilippines; the mountain...
Earth's principal tectonic platesThe principal tectonic plates that make up Earth's lithosphere. Also located are several dozen hotspots where plumes of hot mantle material are upwelling beneath the plates. The Atlantic is still opening along the Mid-Atlantic Ridge under the ocean, withIcelandconstit...
The islands are of two general types: high volcanic islands that support a large variety of plant forms and low-lying coral atolls with poorer soil. Yap Island is distinctive in that it was formed by folds in theEarth’scrust and is continental in geologiccomposition. Each of the four state...
about 2,440 km (1,516 miles), Mercury is the smallest major planet, smaller even thanJupiter’slargestmoon,Ganymede, orSaturn’slargest moon,Titan. In addition, Mercury is unusuallydense. Although its meandensityis roughly that of Earth’s, it has less mass and so is less compressed by ...