“Water freezes in rock cracks and crevices and expands, increasing its volume by 9% (and exerting a force of about 2000 pounds per square inch) as it turns to ice. Hot weather causes the surfaces of rock to expand, while… — Jeff Lowenfels Copy Share Image
“Besides silicon, they contain water and often aluminum, magnesium, and iron as well.” — Jeff Lowenfels Copy Share Image
“Sample your soils Good garden soil contains 30 to 50% sand, 30 to 50% silt, and 20 to 30% clay, with 5 to 10%… — Jeff Lowenfels Copy Share Image
“Chemical fertilizers, pesticides, insecticides, and fungicides affect the soil food web, toxic to some members, warding off others, and changing the environment. Important fungal… — Jeff Lowenfels Copy Share Image
“Water freezes in rock cracks and crevices and expands, increasing its volume by 9% (and exerting a force of about 2000 pounds per square… — Jeff Lowenfels Copy Share Image
