The Berezniki sinkhole first appeared in 1986 and grows every year. Currently, it's more than 200m (650ft) deep, 80m (260ft) long, and 40m (130ft) wide.
First Grade Fairytales: Math Monday Linky - Shape Pizzas, a FREEBIE & a Sale !
Adventures of First Grade: Fractions and Contractions
25 chapter book series for 1st-3rd grade
Educational apps for kindergarten
great list of books to read to/with my kids
Balloon Rockets on Discover Explore Learn - Fun science activity to teach action and reaction. It's a race!