HOW DO RIVERS BEGIN? WHAT IS A RIVER’S LOAD? HOW DO RIVERS SHAPE THE LANDSCAPE? WHAT IS AN ESTUARY? HOW ARE DELTAS FORMED? LAKESFIND OUT MOREA river is a natural channel down which water flows to…
WHAT CAUSES LIGHTNING? WHAT CAUSES THUNDER? HURRICANESFIND OUT MOREA storm is a bout of severe weather, with strong winds roaring at more than 55 mph (88 km/h), lightning flashes, thunder, and…
3.85 billion years ago: Life on Earth begins.10,000 years ago: More than 15 billion acres of land are covered with forest.1750–1850: The Industrial Revolution. Fossil fuels used in factories.1957–…
MININGFOSSIL FUELSFIND OUT MOREThe Earth has many natural resources that make life in the modern world possible. For example, rocks are used in their natural state to make buildings, but…
Earth ScienceAdvanced-Level Science ProjectsEarth ScienceHow Much Oxygen Is in the Air?Which Is More Acidic, Snow or Rain? How Can Different Polymers Be Identified? It seems at times that we…
(Encyclopedia) Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight…
(Encyclopedia) rammed earth, material consisting chiefly of soil of sufficiently stiff consistency that has been placed in forms and pounded down. It has been used for buildings and walls since…
(Encyclopedia) snowball earth, hypothesized condition in which the earth was covered completely by ice during several periods in the Proterozoic. The hypothesis was originally developed to explain…
