Weegy: True, it is unique. User: The most abundant gas in Earth's atmosphere is oxygen. (More)

Weegy: from the inner core but travel to the upper mantle (More)

Weegy: The inner core extends another 900 miles inward towards the center of the Earth. It is believed that this inner core is a solid ball of mostly iron, and nickel. Earth’s outer core, which extends to a depth of around 3000 miles beneath the surface. [ It is believed that this outer core is made up of super-heated liquid molten lava. This lava is believed to be mostly iron, and nickel. The mantle extends to a depth of approximately 1,800 miles, and is made of a thick solid rocky substance that represents about 85% of the total weight and mass of the Earth. The first 50 miles of the mantle are believed to consist of very hard rigid rock. The next 150 miles or so is believed to be super-heated solid rock, that due to the heat energy is very weak. Below that for the next several hundred miles, the Earth mantle is believed to once again be made up of very solid and sturdy rock materials. The first layer consists of about 1o miles of rock and loose materials, scientists call the crust. Underneath the continents, the crust is almost three times as thick, as it is under the oceans. ] (More)

Weegy: Radioactive dating is the measurement of carbon-14 in an object when something is made or born they breath in or absorb carbon-14 Which is in our atmosphere. [ Carbon-14 is naturally radioactive and slowly brakes down and we can measure the amount left to approximately guess the age of the object. Radioactive dating is only useful in dating igneous and metamorphic rock. Organic material that has not fossilized and does not exceed 70,000 years of age can be dated by Carbon dating techniques. Sedimentary rock can only be dated by its association with igneous and metamorphic rock. Read more: ] (More)

Weegy: The Himalayas are part of the string of Eurasian mountain ranges from the Alps to the mountains of Southeast Asia that were formed within the past sixty five million years by global plate-tectonic forces that produced tremendous upheavals in the [ Earth's crust. Etymologically Himalaya means "abode of snow" in sanskrit {from hima "snow", and aalaya "abode"}. The correct name for the range is Himalaya, though the plural Himalayas is often used. The Himalaya stretch across five nations Pakistan, China, India, Nepal, and Bhutan. It is the source of two of the world's major river systems — the Indus Basin and the Ganga-Brahmaputra Basin. An estimated 750 million people live in the watershed area of the Himalayan rivers, which also includes Bangladesh. The Himalaya is a mountain range in Asia Separating the Indian Subcontinent from the Tibetan Plateau. By Extension it is also the name of the massive mountain system which includes the Himalaya proper, the Karakoram, the Hindu Kush, and host of minor ranges extending from the Pamir Knot. ] User: Describe several features on the earth's crust explained by plate tectonics. (More)