1. 40,074km equatorial cimcumference - 24, 901 miles
6378km average radius miles
This true-color image shows North and South America as they would appear from space 35,000 km (22,000 miles) above the Earth. The image is a combination of data from two satellites. The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA’s Terra satellite collected the land surface data over 16 days, while NOAA’s Geostationary Operational Environmental Satellite (GOES) produced a snapshot of the Earth’s clouds.
Radius: 6,370 km
Earth

2. Earth: Then and Now
(4.6 Billion years ago)
The Earth formed about 4.55 Billion years ago. At first it was undifferentiated (no distinct layers). Soon after, dense materials such as Iron sunk to the core because they were more dense, light elements came to the surface to form the crust. The oldest rocks in the Earth’s crust are about 4 billion years old.
Left Image: from Universe Today:
Right image:Earth layers model.png; by Linexerist and Mats Halldin; from Wikimedia Commons ; licensed by Creative Commons
Differentiation: Process that led to Earth’s layers; Denser materials like Iron sank to the center, and lighter materials rose to the crust

3. Compostional Zones Surface Center Less Dense Minerals Crust Mantle
Core
Less Dense Minerals
Most Dense Minerals
The layers can be categorized based on composition. Without going into detail, the crust has many less dense minerals, and the core is made of dense elements like Iron. There are 3 layers divided this way: Crust, Mantle, Core
Image from:
Center

4. Structural Zones Surface Center Lithosphere Asthenosphere Mesosphere
Outer Core
Inner Core
Rigid
Plastic
Solid
Liquid
Other times, layers are categorized based on physical properties. When divided up this way, the Earth has 5 layers (listed above with a one word description of a physical property).
Image from:
Center

5. This shows both ways to divide up the interior of Earth into layers.
Image from:

6. Exploring Deep Earth “The Core” (movie) (optional)
How do we know what the inside of Earth looks like? This is a screenshot from the movie “The Core” which is old enough that many people probably do not recognize at this point. In the movie they take a drilling type ship deep into Earth. Not realistic. No one has seen inside, so how do we know what it looks like?
“The Core” (movie)

7. Exploring Deep Earth (almost real life) (optional)
This is from an anime series called Avatar. The character shown (Toph) is an Earthbender. She can move the Earth. Also she is blind. She uses her Earthbending powers to listen to vibrations in the Earth caused by people walking or things moving underground.
Image source:
(almost real life)

8. Exploring Deep Earth (real life) Seismology, Gravity, Geomagnetism
Scientists don’t have super powers, but do invent instruments that can act like ‘extra senses’ - This picture shows a Seismometer, which records vibrations in the Earth. Like Toph, Scientists then Learn about what’s going on underground from looking at the vibrations. This is only one of several ways we learn about the internal Earth; The geomagnetic field recorded on Earth’s surface tells us about what’s going on in the Earth’s fluid outer core (which generates the field). Gravity is slightly different all over the globe, and this can also tell us things about what is underground.
Seismometer