The region of the atmosphere above the mesosphere in which temperature steadily increases with altitude.
An instrument that measures and records the intensity of an earthquake.
An investigation that can be repeated to give the same or similar results.
A metric (SI) measurement of mass equal to 1,000 grams. 1 kg is equivalent to 2.2 pounds.
A measure of association between two or more variables.
A scientist who uses fossil evidence to study life in prehistoric times.
A scientist who studies the weather.
The scientific study of humans.
An instrument that measures heat.
The scientific study of the human mind.