Want to create interactive content? It’s easy in Genially!
Layers of the inner earth
Sahana Shah
Created on October 25, 2024
Start designing with a free template
Discover more than 1500 professional designs like these:
Transcript
The solid inner core is at the center of the earth. It is made of iron with some nickel and very small amounts of oxygen, silicon, aluminum, and magnesium.
Inner Core
Outer core
Above the inner core is the outer core. The outer core is also made mostly of iron. The inner core is the second-most inner layer.
The mantle is just above the outer core and below the crust. It is made mostly of silicon, oxygen, magnesium, and iron. The mantle is the largest layer.The mantle is divided into the upper mantle & lower mantle. The mantle has yet to be visited, scientists know a little about it from studying underwater volcanoes (where the mantle meets the crust).
Mantle
Less than 1% of Earth’s mass The crust is the thinnest, outermost layer of the earth and is mainly solid rock. It is about 100 km thick. The crust has two sections – continental crust & oceanic crust.
The Crust
Continental Crust
About 3 miles thick Contains of... Oxygen Silicon Aluminum Iron Calcium Magnesium
Oceanic Crust
Between 35-42 miles thick Consits of ... Oxygen Silicon Aluminum Iron – double amount Calcium – double the amount Magnesium – double amount
Lithosphere
The outermost rigid layer of the earth. It is made of the crust and the rigid upper part of the mantle. The lithosphere is divided into pieces called tectonic plates. (Litho – means stone or rock & sphere means globe or ball)
a layer of mostly solid rock that flows and oozes like a milkshake. The lighter plates of the lithosphere float on the asthenosphere. (Asthenos means “weak”)
Asthenosphere
Beneath the asthenosphere, it is the strong lower part of the mantle. It reaches from the bottom of the asthenosphere to the Earth’s core.
Mesosphere
usgs.gov says,"The Moho is present under all continents and oceans, but its depth varies—with an average depth of about 35 km (22 miles) under the continents and typically 6 km (3.7 mi) under the oceans. Although the Moho is defined as the boundary between the crust and mantle, the reason for the abrupt increase in compressional wave speed is uncertain."