Which one covers more of our Earth: snow or trees? Well, there are about 57 million square miles of land. Of that, scientists have used photos from “satellites” in space to map our forests. They found that trees cover about 3/10ths of all land, or 17,200,000 square miles (17.2 million). Meanwhile, people who study the weather have found that 17,800,000 million square miles of land have snow cover. So it’s almost a tie!

*Wee ones:* Which weighs more, 2 pounds of snow or 5 pounds of wood?

*Little kids:* A 1-foot square of snow 10 inches deep can weigh 10 pounds! If you shovel 5 square feet, what numbers do you say to count up the weight in 10s? *Bonus:* To compare, a 50-foot pine tree weighs about 2,000 pounds (2 thousand). If a tree twice as tall weighs twice as much, how much does it weigh?

*Big kids:* If each snowstorm brings 5 inches of snow, how many snowstorms would it take to pile the snow taller than you? *Bonus: *A thousand millions is called a “billion.” If Canada has 1 million square miles of forest with 2,000 (2 thousand) trees per square mile, how many trees do they have?

Answers:

*Wee ones:* The 5 pounds of wood.

*Little kids:* 10, 20, 30, 40, 50. *Bonus:* 4,000 pounds (4 thousand).

*Big kids:* Different for everyone…find the biggest multiple of 5 less than your height in inches, then add 1 more set of 5. *Bonus:* 2 billion trees, or 2,000,000,000 (9 zeroes).And thank you Evan for the cool question and awesome drawing!