Geological Eras

Earth is more than four billion years old, and geologists split that vast stretch into eras that saw the first microbes, the first oxygen, the age of the dinosaurs and the rise of mammals. Can you put Earth's deep history back in the right order?

Science · 10 to rank · medium · 2 minutes to play

More Science quizzes

• Sizing Up the Solar System - Some of the biggest names in our cosmic neighborhood are smaller than you'd think, and a few underdogs punch well above their weight. How good is your sense of scale once you leave home?
• How Loud Is That? - From the faintest murmur to a blast that shakes the ground, the world is full of noise, but how loud is it really? A dozen familiar sounds, from the kitchen to the launch pad, put your ears to the test. Find out how well you can judge the volume of everyday life.
• Taxonomy Ranks - Every living thing has a place in the great family tree of life, from the broadest branches down to a single species. Biology class drilled these levels into you once. Can you still put them back in their proper order?
• Scientists and Their Discoveries - Twelve great minds, twelve breakthroughs that rewrote science, from the inside of the atom to the far edge of the cosmos. Can you pair each scientist with the discovery that made their name?
• Periodic Table Elements - A few elements are freebies. The tongue-twisters hiding at the bottom of the table, not so much. How much of the periodic table can you light up from memory?
• Bones of the Human Body - From the tiniest bone deep inside your ear to the longest one holding you up, your skeleton is built from 206 bones you use every day and rarely name. How many can you pull from memory, head to toe?