Apple
The essential liquid made of H₂O that supports life
water
An opening where magma erupts from within Earth
Volcano
Earth's natural satellite, formed after the Theia impact
moon
The third planet from the Sun, where life exists.
Earth
The galaxy that holds our solar system.
Milky Way
Rocky objects orbiting the Sun, mostly between Mars and Jupiter
Asteroids
A structure built by tiny coral animals
Coral Reef
The layer of gases surrounding Earth
Atmosphere
Soft-bodied sea animals with tentacles that often sting
Jellyfish
The rapid expansion that began the universe
Big Bang
The movement of the plates on Earth’s crust
Plate Tectonics
Preserved remains or signs of ancient organisms
Fossils
A basic force of our universe; it pulls objects toward each other
Gravity
A gas vital for most life on Earth
Oxygen
The Sun and all objects orbiting it.
The Solar System
A rapid burst of diverse life forms about 540 million years ago
The Cambrian Explosion
A Mars-sized body that likely collided with early Earth
Theia
A stream of charged particles flowing from the Sun
Solar Wind
An invisible shield around Earth that deflects solar wind.
Magnetic Field
A five-eyed creature with a flexible snout used to grab food
Opabinia
Cells with a nucleus and complex structures
Eukaryotes
A large, swimming predator from the Cambrian seas
Anomalocaris
An extinct armored arthropod with a segmented body
Trilobite
Ancient microbes that produced oxygen via photosynthesis
Cyanobacteria
A prehistoric fish with armored plates covering its head and body
Placoderm