This lesson provides an introduction to the use of natural gas as an energy source. Topics include its advantages (cleanliness, fewer carbon emissions), disadvantages (difficulty in transport and storage), sources, and...

This interactive lesson on metamorphic rocks starts with a review of the rock cycle and goes on to describe the relationship between metamorphic rocks and their parent rock. The lesson then describes the agents of...

In this activity, students, individually or in teams, have a set amount of time to collect as many specific elements, mixtures, and compounds as possible which are used in daily life and come from earth materials. It...

This identification key has been designed to assist teachers, students, or collectors in the identification of rocks. It consists of a series of "yes/no/then go to" questions that pertain to observations of structure,...

Most planetary scientists expected that lunar samples brought to back to Earth by the six Apollo missions would confirm one of three leading hypotheses of the Moon's origin. Instead, the samples left all three...