Curated OER
Eight Basic Elements of the Earth
Students identify the concept of an element and work with an idea that all of the millions of substances on the earth are various combinations of only 8 elements. They work with the Periodic Table of the Elements and symbols of the...
University of California
Ucla: Discoverer of the Earth's Inner Core
Described on this site is Inge Lehmann (1888-1993 CE), the female scientist, studied seismic waves generated by deep focus earthquakes, discovered that the earth had an inner core.