A natural phenomenon by which all things attract one another including stars, planets, galaxies and even light and sub-atomic particles.
What is gravity?
100
The densest part of Earth.
What is the inner core?
100
Imaginary lines that allow you to determine how far east or west of the prime meridian a location is on Earth.
What are longitude lines?
200
Our galaxy.
What is the Milky Way Galaxy?
200
The study of solid Earth.
What is geology?
200
The age of Earth (+/- 200 million years).
What is 4.6 billion years?
200
Convection in this layer of Earth causes plate tectonics.
What is the mantle?
200
The height of an object above sea level.
What is elevation?
300
The age of the Universe (+/- 200 million years)
What is 13.8 billion years?
300
A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
What is a hypothesis?
300
Our solar system formed from the gravitational contraction of one of these.
What is a nebula?
300
A map that shows the size and shape of the land surface features of a region.
What is a topographic map?
400
The fifth planet from the Sun.
What is Saturn?
400
A well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation.
What is a scientific theory?
400
A set of connected things or parts forming a complex whole.
What is a system?
400
The layer that gives Earth a magnetic field.
What is the outer core?
400
The location at 90 degrees S
What is the South Pole?
500
The species alive today that humans are most closely related to.
What are chimpanzees?
500
The evaluation of work by one or more people of similar competence to the producers of the work.
What is peer review?
500
The element that is the chemical basis for all life on Earth.
What is carbon?
500
How we know what is deep inside Earth.
What is seismology?
500
The intersection of a sphere's surface with the plane perpendicular to the sphere's axis of rotation and midway between the poles.