Spherical Earth

src: i.ytimg.com The earliest reliably documented mention of the spherical Earth concept dates from around the 6th century BC when it appea...

Nutrient cycle

src: photos1.blogger.com A nutrient cycle (or ecological recycling ) is the movement and exchange of organic and inorganic matter back into...

Earth Day

src: mossgreenhouses.com Earth Day is an annual event celebrated on April 22. Worldwide, various events are held to demonstrate support for...

Diatomaceous earth

src: harmonicarts.ca Diatomaceous earth ( ), also known as D.E. , diatomite , or kieselgur / kieselguhr , is a naturally occurring, soft, s...