That is, if you observe the spectrum of a star and can determine the wavelength where the emission peaks (Î»max), you can calculate that starâs temperature. Here is another copy of the plot that we studied in Lesson 3: Figure 4.1: Two-dimensional plot of the spectrum of a blackbody with different temperatures.
Igneous rocks usually contain the most crystals. The longer it takes the magma to cool, the larger the crystals.
Rocks formed when magma becomes solid are known as igneous (fire-formed) rocks. One type of igneous rock is granite, which is formed from magma that never reaches the Earth's surface. This magma slowly cools within the Earth. Large crystals of minerals grow within the magma as it gradually hardens.ocks formed when magma becomes solid are known as igneous (fire-formed) rocks. One type of igneous rock is granite, which is formed from magma that never reaches the Earth's surface. This magma slowly cools within the Earth. Large crystals of minerals grow within the magma as it gradually hardens.