The inside of the Earth isn’t all rock and dirt. If you dig down a few miles, you reach the “mantle,” which is crumbly and can move. 1,800 miles below that, you reach the outer core, which is super-hot liquid. Finally 1,400 miles below that is a solid ball, the white-hot inner core! So baker Rhiannon at cakecrumbs.me baked an amazing cake to show these layers. She made vanilla buttercake for the white core, yellow lemon cake for the outer core around it, and red Madeira sponge cake for the mantle layers.
Lace up: Earth is a giant round ball. Can you see any round ball shapes in your classroom?
Jog: How many colors can you count in the cake — both the inside and outside?
Sprint: If she cut the cake into 10 slices and you ate 2 of them, how many pieces would be left?
Hurdle: This half-Earth cake looks like it could serve 12 slices. How many same-size slices would a whole Earth cake serve?
High Jump: If the baker needed 2 cups of white batter, twice as much yellow batter as white, and 3 times as much red as yellow, how many cups did she need in total?
Pole Vault: This cake is about 1 foot wide. Earth is about 8,000 miles wide. If there are about 5,000 feet in a mile, about how many times as wide is our real Earth compared to this cake?
Answers:
Lace up: Answers might include a globe or the round part of a light bulb.
Jog: We see 5 major colors: white, yellow, red, blue and green.
Sprint: 8 slices.
Hurdle: 24 slices.
High Jump: 18 cups of batter, since you need 4 cups of yellow and 12 cups of red.
Pole Vault: 40,000,000 (40 million) times as wide!
