The earth’s interior has a number of layers. The main layers are the earth’s crust, earth’s mantle, and the earth’s core. In addition to these major layers, scientists divide the mantle into the upper and lower mantle. The core is divided into a liquid outer core and a solid inner core.
Researchers studying the inner of the Earth use earthquake waves to determine what lies beneath our legs because it’s impossible for drilling equipment to drill to the core of the Earth. Earth’s interior layers, NASA – P waves – P waves speed up when rocks change density. This is how a mantle-crust boundary was discovered. The earthquake waves speed up at the limit and are slightly deflected by the higher density of the rocks. S waves – S waves, produced by all earthquakes, are stopped when they reach the outer core of the Earth. S waves travel only through solids. They don’t travel through liquids and gases. Isaac Newton’s measurements – Three hundreds of years ago Isaac Newton calculated the average density of our planet. He used his study of the planets and the pull of gravitation to determine the average density of Earth. He discovered that the rocks in the inner of the Earth had to be much denser than crustal rocks found on the surface of the Earth.
Earth’s density – Today scientists have many more tools to study the Earth and have determined that Newton’s estimate of the Earth’s density was essentially correct. The density of the continental crust is between 2.7 and 3.0 g\/cm. The density of the oceanic crust is between 3.0 and 3.3 g\/cm. The average density of the core is 10.7 to 12 g\/cm. The interior core, which is solid, is about 13.5 g\/cm. Earth’s cores – The Earth’s core has two layers which are mainly iron. The increasing heat and pressure are so great that the iron and its alloys became solid in the interior core.
Planet Earth Links
More Planet Earth Links – The Earths Mantle Is the mantle molten rock or solid rock? Discover what we know about it large layer of the Earth. Iceland Volcanoes Did you know volcanoes in Iceland formed due to the Mid Atlantic Ridge and a hot spot? Tectonic Plate Boundaries Find out about the major types of crustal plaques and the boundaries around them. Earths Atmosphere Find out which layer meteors burn up, where the International Space station is located and more
The two kinds of crusts that make up this layer of the Earth
– Lithosphere Find out if you know the two kinds of crusts that make up this layer of the Earth and which one is younger? Earths Interior Our planet is composed of many layers and scientists working as a detective is uncovering the secrets of the earth interior. Planet Earth Find out about our planet from the Earth’s core to the outer borders of our atmosphere.