did not support this hypothesis. At the heart of our planet lies a solid iron ball, about as hot as the surface of the sun. It is a common thread that is woven into the NGSS, science practices and in the cross-cutting concepts. Earth's crust is what we walk on every day. Was the interior of the early Earth more or less homogenous than it is today? on response to stress? Broadly speaking, the Earth has four layers: the solid crust on the outside, the mantle and the core -- split between the outer core and the inner core. Do you think this representation was accurate? BetterLesson reimagines professional learning by personalizing support for educators to support student-centered learning. Which layer is a subset of the other - crust or lithosphere? The solid inner core is too hot to hold a permanent magnetic field (see Curie temperature) but probably acts to stabilize the magnetic field generated by the liquid outer core. Check out this Using Songs and Rhythm Information Sheet to see how and why I use songs and rhythm in the classroom. Click here for more information on the importance of models. Then they make a paper model of the Earth's layers to put in their science notebooks (or take home). These ideas will be paramount as we continue through this unit and learn about all of the changes of the Earth. Oreo cookies--1 per child (1 package has over 50 cookies), M&Ms--1 per child; a small bag will be enough for a classroom, chocolate syrup--1 small bottle --(You will have lots left over), small plate or napkin--1 per child (to put the Oreos on). Layers of the Earth interactive science journal page, Layers of the Earth student diagram worksheet, Layers of the Earth diagram teaching poster, Science Strategy- Using Songs and Rhythm Information Sheet, Oreo cookie model explanation turn and talk partners video clip, my class singing Layers of the Earth song video clip, Using Skittles to Learn about Weathering and Erosion. The troposphere starts at the Earth's surface and extends 8 to 14.5 kilometers high (5 … This ignores the less abundant enstatite chondrites, which formed under extremely limited available oxygen, leading to certain normally oxyphile elements existing either partially or wholly in the alloy portion that corresponds to the core of Earth. They also need to be thinking about how each of the parts were represented and what was chosen for the representation. As they progress through the years, they will have to understand that models have their limitations. Watch this video clip of my class "getting into the groove" singing the Layers of the Earth song. Henry Cavendish in his torsion balance experiment of 1798 found a value of 5.45 g/cm3, within 1% of the modern value. 9 The current scientific explanation for Earth's temperature gradient is a combination of heat left over from the planet's initial formation, decay of radioactive elements, and freezing of the inner core. Objects and organisms can be described in terms of their parts. BBC News, "What is at the centre of the Earth? Some have argued that the inner core may be in the form of a single iron crystal. How were the layers represented? Hopefully someone will comment that we also need to represent the outer core. In early stages of Earth's formation about 4.6 billion years ago, melting would have caused denser substances to sink toward the center in a process called planetary differentiation (see also the iron catastrophe), while less-dense materials would have migrated to the crust. Crust. They also work on respectful listening of someone else's ideas. s. The average density of Earth is Earth's gravity according to the preliminary reference earth model (PREM). The liquid outer core surrounds the inner core and is believed to be composed of iron mixed with nickel and trace amounts of lighter elements. Composition: iron and nickel. The squirt needs to be a little larger than the diameter of the M&M. How could you model each of the layers of the Earth? Which layer makes up a "lithospheric plate" - crust or lithosphere? Make sure they do not glue down the entire crust layer or they will not be able to lift the Earth top layer up. The densities are between 9,900 and 12,200 kg/m3 in the outer core and 12,600–13,000 kg/m3 in the inner core.[21]. August 21, 2018. [17] Because the average density of surface material is only around 3.0 g/cm3, we must conclude that denser materials exist within Earth's core. Mechanically, it can be divided into lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core. Having the children explain their idea to a partner helps them clarify their thinking. So I am going to have the children build their very own model. The Earth’s … The inner core was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel. In the previous lesson, the children explored models as the teacher explained the layers of the Earth. Systems in the natural and designed world have parts that work together. Seismic measurements show that the core is divided into two parts, a "solid" inner core with a radius of ≈1,220 km[20] and a liquid outer core extending beyond it to a radius of ≈3,400 km. [33][34], Recent evidence has suggested that the inner core of Earth may rotate slightly faster than the rest of the planet; in 2005 a team of geophysicists estimated that Earth's inner core rotates approximately 0.3 to 0.5 degrees per year faster. Some have speculated that the innermost part of the core is enriched in gold, platinum and other siderophile elements.[30]. How long have the Earth's layers existed? {\displaystyle {\tfrac {9}{5}}} But before we begin our modeling, I show this short video. In this lesson, they get to make their very own simplistic model. Then they place glue at the backside of the fold and glue down. As a science practice and part of the NGSS, the children are expected to understand and develop models. Inner Core. Then they glue the inner layer down in their science notebook or on a piece of paper. How does the composition of rock change across the lithosphere/asthenosphere boundary? Check out this. [22] Other experimental studies show a discrepancy under high pressure: diamond anvil (static) studies at core pressures yield melting temperatures that are approximately 2000 K below those from shock laser (dynamic) studies. By the end of this unit, called Earth Changes, the children will have to understand how the movement of the crust and mantle creates changes, either quickly or slowly. They then hold the tab at the top down and lift the top layer up, which creates a fold. Schematic view of the interior of Earth. Watch the short video for an activity description and to preview the resources. In the context of rocks, what does the word "stress" refer to?