Click on each illustration below to view the motion of the wave. What evidence was used to support the Pangaea theory? Assignments: The following assignments should be completed by the dates provided. For performance reasons and simplicity the beta particles are modeled like alpha particles. Compare and contrast latitude and longitude. In a radiative capture event the neutron is captured by the nucleus, and one or more gamma rays are emitted. The major experiments about alpha sources are to determine their range in materials, which can be simulated using Radlab.
Plate motions cause mountains to rise where plates push together, or converge, and continents to fracture and oceans to form where plates pull apart, or diverge. Neutrons are neutral particles, and they are difficult to detect when they are highly energetic, since they would not interact with the detector. You need to watch the first video and any one of the other two videos. Caution: the journal and data entry sections of the simulations do not work, so you probably will want to arrange for students to write these on their own pages. For every ten milliseconds, the sources in the environment decay via forced decay. If this process happens in a detector, the whole energy of the gamma photon is assumed to be deposited in the detector. However, most of the avaliable codes are for experienced users and require long learning curves.
Have students look at the for alpha and beta decay. Students can supplement this site with a visit to. As usual, you have unlimited tries to get your best score. Record your descriptions and turn them in on In response to soil erosion and degradation governments have initiated soil conservation guidelines to change the course of destroying our farmlands and the lithosphere in general. Visit this site for more information about strontium-90 and about the nuclear accident in Chernobyl in 1986 and its aftermath. Moreover one needs some shielding material to measure its properties, such as the attenuation coefficient. The supercontinent began to break apart about 200 million years ago, during the Early Jurassic Period about 135 million years ago , eventually forming the modern continents and the Atlantic and Indian oceans.
Also, return to the questions you asked in the introduction to the lesson and allow students to revise their answers. The final lesson, , is based on gathering evidence in the present and extrapolating it to the past. The radioactive particles generated from the sources initially penetrate to the corresponding environment isotropically. You will also learn some exciting facts about plate tectonics both past and future by watching the first video. The key to learning the rock cycle is to know the specifics processes that form each type of rock. Over tens of thousands of years a chain of islands may form. Many of these labs are useful to substitute for activities in the class that are too costly, dangerous, or time consuming.
Using these detectors and the NaI3x3 detector the user can create an experiment in which one can see the effect of detector size on the spectrum and on the geometric efficiency. In fact, some definitions of the lithosphere stress its ability to conduct heat associated with the convection taking place in the plastic mantle below the lithosphere. It is still hot after all this time because it contains radioactive elements which were created in a supernova explosion before the earth formed. The oceanic crust is primarily composed of basaltic rock while the continental crust is primarily composed of granitic rock. Advise students to read through the simulation first so that they understand what they should do. Take copious notes so that you can use them as a reference for your summary. For a basic radiation detection and measurement laboratory education, one needs to have gamma, beta, alpha and neutron sources, at least one detector to detect each type of radiation and other supplemental nuclear instrumentation to perform experiments.
After one half-life, half of the nuclei will have disintegrated, leaving 50 nuclei. Furthermore, these specific nuclear codes used in these simulations are difficult to setup and edit without deep knowledge about radiation physics and an understanding of the codes. Hint: How are oceanic plates formed and destroyed? And the user can use different types of detectors listed above to analyze the responses of these detectors via their spectrums. Please watch the videos below to learn more about Earth's interior structure. Assessment In addition to using answers to students' analysis questions and their graphs for assessment, consider having them respond to the following in their science journals or as a homework assignment: Strontium is chemically similar to calcium.
This magnetic field acts like a force field; a magnetic bubble around the Earth. Although the rocks of the lithosphere are still considered elastic, they are not viscous able to flow. They need only know that such calculations are possible. Key Vocabulary: crust, mantle, outer core, inner core, asthenosphere, Pangaea, continental drift, seafloor spreading, ocean trench, subduction, slab pull, ridge push, mantle convection, rift valley, hot spot,convergent boundary, divergent boundary, transform boundary, Ring of Fire, buoyant, Glossopteris, Mesosaurus, Lystrosaurus, Cynognathus, fault, mid-ocean ridge, isochronic map, magnetic reversal, sonar, Harry Hess, Alfred Wegener. It is roughly 1,800 to 3,200 miles 2,890 to 5,150 km below the surface and about 1,400 miles 2,300 km thick. Have students write their answers to these questions in their science journals. However current release of the software is operational and usable.
The questions below will help guide you in writing your summary, but are not to be answered directly. There is a lot of work done to simulate these types of experiments using Monte Carlo methods. If an elastic scattering occurs it is assumed to be isotropic, and the no energy is deposited within the detector. They strike suddenly and violently and can occur at any time, day or night, throughout the year. It may be combined with the Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, which can be done while students are flipping their candies. Weathering changes rocks from a hard state, to become much softer and weaker, making them more easily eroded. Four type of experiment can be simulated using Radlab.