The Earth we’re standing on is a huge ball zooming through space. It’s 8,000 miles wide, giving it almost 200 million square miles of area! (To compare, your whole town might be less than 10 square miles). We have millions of square miles of ocean and land, much of which doesn’t even have people living there. So our friend Evan K., asked, which one does Earth have more of, snow or trees? and has drawn a Star Wars clone trooper thinking about it. For starters, more than 2/3 of Earth is covered by water (interestingly, your own body is about 2/3 water, too). That leaves us about 57 million square miles of land. Of that, scientists at NASA, who fly rockets and astronauts into space, have used photos from “satellites” to map our forests. They found that they cover about 3/10ths of all land, or 17,200,000 square miles (17.2 million). Meanwhile, people at NOAA, who measure the weather, have found that 17,800,000 million square miles of land have snow cover. So it’s almost a tie! As we’ll see below, those trees and snow patches weigh a lot more than you think, too.
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 trees per square mile, how many trees do they have in total?
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!