The earth's mantle is a layer of rock beneath the crust that is 1800 miles thick. The deepest part of the mantle is hotter than the area near the Moho so that the deepest rocks are molten. Below the mantle is the earth's core: the molten outer core which is 1400 miles thick and t...
"The surface of the earth is made of tectonic plates, which are about 100 kilometers thick, they move around together. So when they collide or move apart, they form earthquakes as the pressure gathers," explains seismologist Carlo Doglioni, President of Italy's National Institute...
The troposphere, the bottommost layer of Earth’s atmosphere, is the densest of the five atmospheric layers and extends from ground level up to about 10 kilometers in altitude. This is the layer where humans live and breathe, as it contains the air we depend on for survival. The tropospher...
then you need to work through the layers of the crust till you get to the core. Every planet, including the gas giants, is believed to have a core. Earth has a molten iron core that generates heat and produces the protective magnetic fields that protect us from the Sun's harmful rays....
Diamonds started out as carbon that crystallized deep in the earth under great pressure and temperature. Volcanic activity brought the diamonds to the Earth’s surface in kimberlite magma. Erosion of kimberlite deposits over many years caused the released diamonds and indicator minerals. Advancing and...
the confused owner of a cone five hundred feet high. Within two years it had topped out at almost fourteen hundred feet and was more than half a mile across. Altogether there are some ten thousand of these volcanoes on Earth, all but a few hundred of them extinct. There is, however, ...
The speed of growth depends on the type of bamboo, the earth and the season. Normal bamboo grows 3—10 cm a day. It usually grows in tropical (热带的) areas. 3 Bamboo plants are found in Asia, Australia, parts of Africa, and South America. One of the world’s oldest building ...
Which word cannot be used to describe the Navi’s life? A. Savage 野蛮B. HumaneC. EcologicalD. Civilized正确答案:A Which of the following statements is NOT true? A. In Greek mythology, Pandora was the first woman on earth.B. The Tree of Souls, besides being a connection to Eywa, als...
Theprimary sectorinvolves companies that participate in the extraction and harvesting of natural products from the Earth. Primary sector companies are typically engaged in economic activity that utilizes the Earth's natural resources, which are sold to consumers or commercial businesses. ...
National Pi Day is recognized today in the U.S. and around the world. Here's what to know about the quirky holiday, and how to celebrate.