Because the Earth is not a perfect sphere, the circumference around the equator (24,900 miles) is slightly larger than the circumference around the poles (24,800 miles).
The mean average temperature of the entire planet is 59F.
It doesn’t take the Earth 365 days to orbit the Sun, but rather around 365 1/4. That extra quarter day (around six hours) is why we need to add an extra day to our calendar every four years.
The Earth’s crust is the thinnest, coldest,and least dense of all the Earth’s geological layers. At its thickest point, the crust is no more than around 30 miles thick. The Earth’s outer core is more than 1,400 miles thick.
The crust is also divided into two sections known as the sial (the lighter, less dense rocks that form the bedrock of the continents) and the sima (the denser rocks, lying under the sial, that form the ocean bed).
The Earth’s largest lake is actually a sea. The Caspian Sea in west central Asia/the far easter of Europe is 1,400,ooo sq miles in size. That is more than 40 times the size of Lake Superior.
The Sahara is the world’s largest sandy desert and is growing by around 30 miles every year.
The world’s oldest desert, meanwhile, is the Namid Desert in southern Africa. It has been covered in arid sand for more than 70 million years.
