Volcanic materials ultimately break down and weather to form some of the most fertile soils on Earth, cultivation of which has produced abundant food and fostered civilizations. The internal heat associated with young volcanic systems has been harnessed to produce geothermal energy. Most of the metallic minerals mined in the world--such as copper, gold, silver, lead, and zinc--are associated with magmas found deep within the roots of extinct volcanoes.
When peanut <span>seedlings were grown under identical conditions, the factor that could count for differences in height among the seedlings is GENETICS.</span>
