Topics covered in this slideshow include the Earth's interior, seismic S- and P-waves, the crust and mantle, phase boundaries encountered by seismic waves, the Earth's internal heat, gravity and density, gravitational anomalies, the...

This is the homepage of the spacecraft NEAR Shoemaker, the first to conduct a long-term, close-up study of an asteroid. The site contains information on the asteroid 453 Eros, including mass, structure, geology, composition, and gravity.

A front on photo of a massive dam built part way along a river. This giant man made structure in the Glen Canyon of USA holds back a large volume of water and is designed to remain strong for many years.

The Step Pyramid Complex was built for King Djoser of the Third Dynasty by his Vizier, Imhotep, at Saqqara. It was copied after the existing structures of Egypt's capital in order for the pharaoh to repeat his earthly experience in the...

Humberstone and Santa Laura works contain over 200 former saltpeter works where workers from Chile, Peru and Bolivia lived in company towns and forged a distinctive communal pampinos culture. That culture is manifest in their rich...