Encyclopedia of Earth: Geology: Limestone

We all know limestone weathers, but what affects the rate of weathering? Young scientists investigate the physical and chemical weathering of limestone (chalk) through experimentation. First, they conduct trials with different-size...

In this earth science worksheet, students use the clues given at the bottom of the sheet to solve the crossword puzzle on mineral and rocks. They identify the various types of rocks formed and specific examples of these rocks.

Fossils ... from space? Science scholars discover evidence in a limestone quarry that helped researchers learn about a meteor shower that lasted hundreds of thousands of years through an interesting video from Brain Scoop's Fossils and...

Article covering the Silurian Period, which lasted from 443 million to 417 million years ago. It covers the subdivisions of this Period, some life forms preserved in the fossil record, geology, and climate. (Published: January 22, 2010)

Article describing the Pliocene Epoch, which lasted from 5.3 million to 1.8 million years ago, and was part of the Cenozoic Era. It covers subdivisions of the Pliocene, geology, and climate. (Published: January 20, 2010)

Article describing the Proterozoic Eon, which lasted from 2.5 billion to 543 million years ago. It covers the subdivisions of the Proterozoic Eon, geology, Earth's atmosphere at the time, climate, and life forms. (Published: July 26, 2010)

Article explaining what petroleum crude oil is, its composition, how it is formed, sources, how it is recovered, different classifications, products made from it, and its history. Includes a chart showing statistical information for...

In this amazingly comprehensive tutorial you will learn about the geological and environmental changes that occurred during the geologic time scale.

Students study the earth in relation to the solar system.  For this planetary lesson students complete several investigations into the measurement of the earth and its magnetic field.

Geology can be a lot of fun. Learners review geology related vocabulary, make flashcards, use encyclopedias to answer questions, then explore the formation of coal. They identify dates and order them into key time frames of geologic...