Each card features a confounding question on one side, with the answer on the other side.
A sample question:
Match these words with their definitions:
1. asteroid 2. comet 3. meteoroid 4. meteor 5. meteorite
a. small particle from an asteroid or comet
b. meteoroid that survives passage through Earth’s atmosphere and lands on the planet’s surface
c. inactive, rocky body orbiting the Sun
d. light phenomenon created when a meteoroid is vaporized on entering Earth’s atmosphere
e. sometimes active object whose ice can vaporize in sunlight, forming a dust and gas atmosphere
ECOtime, a project of The ECOlogical Calendar, can be heard as part of National Public Radio's “Living On Earth” show and on Green 960 am in the California Bay Area.