Microbes - alive and thriving -- have been found sealed within a fracture of 2-billion-year-old rock beneath Earth's surface.

Milwaukee Riverkeeper will hold a cleanup Saturday followed by the Rock the Green Earth Day Celebration at the Harley-Davidson Museum. 31,181 people played the daily Crossword recently.

Celebrate Earth Day this weekend at the free, family-friendly Rock The Green event featuring live music, vegan and non-vegan food, free chair massage, goat yoga and more! Earth Day is Tuesday ...

Slate is dark grey/green in colour ... are formed when either igneous or sedimentary rocks are changed. Heat and/or pressure will cause the elements in the original rock to react and re-form.