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View Resource The Origin of the Moon

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 explanations unconfirmed, requiring the development of a new hypothesis for how the Moon formed. This video segment shows Apollo 15 astronauts collecting a type of rock (anorthosite) that...

View Resource Porosity

This experiment introduces students to the concept of porosity, the idea that solid rock is often not so solid, but contains spaces (pores) between particles where water, oil, or gas may be found. The experiment, which can be performed as a demonstration or by the students themselves, involves adding measured volumes of water to known volumes of sand, silt, or gravel in beakers. A materials list,...

View Resource Phases of the Moon

The Moon, Earth's only natural satellite and one of the brightest objects in its sky, appears in the sky in many different shapes. Over the course of a month, the observed shapes result from the interaction of the Moon's orbit around the Earth and the sunlight reflected from it. This interactive resource explains the relationship between the Moon's orbit and its phases, and also explains how...

View Resource Plate Tectonics: An Introduction

In the early 1900s, most geologists thought that Earth's appearance, including the arrangement of the continents, had changed little since its formation. This video segment describes the impact the theory of plate tectonics has had on our understanding of Earth's geological history, and provides a brief overview of what is currently known about the Earth's tectonic plates and their motions. The...

View Resource Organic Farming: Conserving Top Soil

Fueled by economic pressure to maximize crop yields and government incentives to produce only one type of crop, contemporary American farmers have been facing a crisis reminiscent of one that hit the Great Plains in the 1930s. This video segment explains why more and more farmers are opting for sustainable, organic farming practices to help preserve the valuable topsoil that they rely on for...

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