Elements in Earth's Crust and Their OriginsElement Volcanic Activity Mantle Degassing Metamorphic/Weathering Processes Extraterrestrial Sourcesoxygen48%25%22%10%silicon6%28%46%0%aluminum12%7%66%15%Earth’s crust is composed of many elements, some of which originate primarily from four sources: primordial volcanic activity, mantle degassing, metamorphic and other weathering processes, and finally extraterrestrial sources such as meteorites. Geologist Celeste Ramirez led a team that calculated average rates of composition of elements in the crust (such as oxygen and silicon) showed that older sources, such as volcanic activity or mantle degassing, are responsible for higher rates of nonmetals (nitrogen, oxygen, phosphorus, etc.) in the Earth’s crust than metals (aluminum, gallium, tin, etc.), which are deposited by more relatively recent processes such as weathering and meteorite impacts. For example, whereas 48% of the oxygen found in Earth's crust is a result of volcanic activity -------Which choice most effectively uses the data from the table to complete the example?25% of the oxygen in Earth's core comes from mantle degassing.eliminate66% of the aluminum in Earth's core comes from weathering processes.eliminate0% of the silicon found in Earth's core comes from extraterrestrial sources. eliminate22% of the oxygen in Earth's core comes from extraterrestrial sources.

Chemical Composition of the Earth, by layerElement Crust Mantle Outer Core Inner CoreIron 5.63% 8.72% 67.8% 85.2%Oxygen 46.1% 44.8% 5.31% >1%Silicon 28.2% 21.5% 3.97% >1%The Earth is composed of four distinct layers–the solid outer crust, the viscous mantle, the liquid outer core, and the solid inner core. Scientists have long researched and hypothesized the chemical composition of each layer, using seismic waves, volcanic activity and magnetic fields to determine measurements. The crust and mantle are composed heavily of oxygen and silicon while in the outer core and inner core are comprised of primarily Iron. For each deepening layer, the density of the matter increases. Scientists have hypothesized that this is due to the abundance of heavy elements like iron in the outer and inner core compared with lighter elements like oxygen and silicon in the crust and mantle. For example, the percentage of iron in the mantle is 8.72% whereas the percentage of ------- Which choice effectively uses data from the table to complete the example?iron in the crust 5.63%. eliminateiron in the inner core is 85.2%. eliminateoxygen in the mantle is 46.1%. eliminateoxygen in the inner core is >1%.

While there are many hundreds of different minerals, the overwhelming majority of Earth's crust is composed of just eight common rock-forming minerals.Group startsTrue or False

Which of the following is found in the Earth's crust in its elemental state?ASilverBIronCCalciumDZinc

The dominant element in the Earth’s crust is:Group of answer choicesSilicaOxygenIronPotassiumSilicon

The second most abundant element in the Earth is Group of answer choicesIron.Oxygen.Silicon.Aluminum.