Earth's History
Rock Stars
Space Explorers
Ocean Depths
100
Event that triggered the extinction of all non-avian dinosaurs
What is an asteroid impact?
100
This type of rock forms when magma cools and hardens, either above or below ground
What is igneous rock?
100
Theorized event that started our universe
What is the Big Bang?
100
This largest living mammal can be found in Earth's oceans
What is a blue whale?
200
Earth's most recent supercontinent, shown here
What is Pangea?
200
These rocks form at high temperatures and pressures deep within Earth, changing existing rocks into new types
What is metamorphic rock?
200
These rocky objects orbit the Sun, mostly between Mars and Jupiter, and are leftovers from the solar system's formation.
What are asteroids?
200
Percentage of Earth covered by ocean
What is 70%?
300
Scientists estimate that Earth formed approximately this many billion years ago from dust and gas in the solar nebula
What is 4.5 billion years ago?
300
Layer of earth made from molten iron and nickel
What is the outer core?
300
This space telescope, launched in 2021, can see further into space and time than any previous telescope
What is the James Webb Space Telescope?
300
The deepest point in the world, found in the Pacific Ocean
What is Mariana's Trench?
400
Most likely habitat for Earth's earliest life forms
What is a hydrothermal vent (deep, hot ocean)?
400
Common name for the mineral halite
What is table salt?
400
This moon of Jupiter is covered in ice and may have a liquid ocean beneath its surface.
What is Europa?
400
An octopus has this many hearts
What is three?
500
These early life forms, appearing about 3.5 billion years ago, were the first to produce oxygen through photosynthesis
What are cyanobacteria? or What is algae?
500
This scale measures the hardness of minerals, with talc at 1 and diamond at 10
What is the Mohs Hardness Scale?
500
This is the closest galaxy to the Milky Way
What is Andromeda?
500
This marine creature can regenerate body parts
What is a sea star?