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.
The width of the Earth â its diameter at the equator â is 7,926 miles. Because the Earth is not a perfect sphere, the measurement of the planet from North Pole to South Pole is slightly less: 7,900 miles. The Earth's average radius is 3,959 miles. Keep Learning.