Structural Engineer Costs. Homeowners spend an average of $512 on hiring a structural engineer, with most homeowners spending between $319 and $708. The larger and more detailed the project is, the higher the cost of hiring a structural engineer becomes. Some professionals charge by the job, while others may charge by the hour.
The total surface area of Earth is about 197 million square miles (509 million square km). About 71 percent is covered by water and 29 percent by land.
Because the Earth slightly flattens out at the poles, its shape is an oblate spheroid, meaning that it is similar to a sphere but is not perfectly regular. The circumference of the Earth at the equator is 24,902 miles. Again, that is a bit more than its circumference from pole to pole, which is 24,860 miles. At 5.52 grams per cubic centimeter, the Earth is the densest planet in the solar system.