Visitors can read about the characteristics of volcanism on Mars and how it differs from volcanism on our own Moon. A map is provided to show the locations of various volcanic structures. Links to related topics are also included. Full description.

Visitors can read about the characteristics of volcanism on Venus and how it differs from volcanism on Earth. A map showing the locations and types of volcanic structures on the surface of Venus is provided, along with links to other related topics. Full description.

Users can read about the characteristics of volcanic activity on the Moon and how it differs from volcanism on Earth. A lunar map accompanies the text, showing the prominent mare, or "seas", which are actually volcanic plains. Links to related topics are included. Full description.

Visitors can access information about geological research and exploration in North Africa. This information can be found by clicking on an interactive map of North Africa (Morrocco, Algeria, Tunisia, Libya, and Egypt). Materials presented here consist of a message board, news articles, current and planned geological studies, an address database, a literature database, a picture database, and a collection ... Full description.

Users can access photographs of various forms of erosion, erosion damage, and "before and after" photos showing how the problem was brought under control. Each photograph is accompanied by a description of the activity which is taking place. Full description.

This resource describes what mineral sands are, and discusses the heavy, dark-colored minerals that they contain (rutile, ilmenite, zircon, monazite). A map shows locations of mineral sands deposits in Australia. Full description.

This account of the history and evolution of the Mississippi River Delta makes use of text, photographs, and satellite imagery to describe how the delta has formed and migrated throughout recent geologic history. Users can read about the formation and subsequent abandonment of various delta lobes and how deltaic landforms (back bays, levees, barrier islands) are formed and destroyed as a result of ... Full description.

Until now, studies that involve the ocean floor have been at a disadvantage due to an almost complete lack of accurate marine base maps. Materials presented here serve to introduce the Pacific Seafloor Mapping Project, an endeavour by the United States Geological Survey to produce high-resolution base maps of the sea floor. These maps are intended for use in identifying areas of erosion and deposition ... Full description.

A study of the geology of Mars should reveal answers to such questions as how Mars developed into the planet we see today and what accounts for the differences and similarities between Earth and Mars. Visitors to this site can learn about ancient magnetism recently discovered by the Mars Global Surveyor that suggests the planet was once more dynamic and Earth-like with a magnetic field shielding the ... Full description.

Sand covers only about 20 percent of the Earth's deserts. Nearly 50 percent of desert surfaces are gravel plains where removal of fine-grained material by the wind has exposed loose gravel and occasional cobbles. This web page, produced by the U.S. Geological Survey, features text and photographs that describe desert landforms, soils, plants, and the role of water in the formation of desert landscapes. ... Full description.