The lesson covers the following information: 1  Explaining what gastrovascular cavities represent. 2  Exploring the relationship between gastrovascular cavity and tissues. 3  Detailing diffusion's role in spreading nutrients.  Describing the 1  coelom. Clarifying the roles of cnidarians and platyhelminthes.
The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole â the meridional circumference â Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.
The Earth has a radius of 3,959 miles, a diameter of 7,926 miles and a circumference of 24,902 miles. Earth has a mass of 6.6 sextillion tons and a total surface area of 197 million square miles. It is the fifth largest planet in the solar system.