Agenda 2/24 Warm-Up: What is below your feet here on campus at McEachern? Warm-Up Check Pass back/discuss Unit 1 Test Notes: Layers of the Earth Activity: Earth Layers Analogy

The Earth’s Layers

Objective: The learner will be able to identify characteristics of the Earth's layers.

The Earth is divided into three layers.

Crust The crust is the layer that you live on so it is the most widely studied and understood. It is also known as the lithosphere.

Crust The crust is made of the lightest matter and the core consists of heavy metals

Crust The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers.

Crust The crust of the Earth is broken into many pieces called plates. The plates move along the soft mantle which is the layer located located below the crust.

Crust The plates move along smoothly but sometimes they get stuck and pressure builds up.

Crust The pressure builds and causes an Earthquake as rocks break and crack. San Francisco City Hall after the 1906 Earthquake. (from Steinbrugge Collection of the UC Berkeley Earthquake Engineering Research Center)Steinbrugge Collection of the UC Berkeley Earthquake Engineering Research Center

Mantle The mantle is the largest layer of the Earth. The top layer of the mantle is known as the asthenosphere. Below that are the upper and lower mesosphere. It is made of hot, dense rock. The rock in the mantle flows like asphalt because of the temperature differences found in the mantle.

Mantle The movement of the mantle create the movement of the Earth’s plates.

Core The core of the Earth is much like a ball of very hot metals. The inner core is surrounded by a fluid iron outer core.

Core