Time Travel
Atoms are made up of protons, electrons, and these neutral particles.
What are neutrons?
A method of dating the origin of rocks that measures the ration of radioactive argon to radioactive potassium in the rock.
What is potassium-argon dating?
A molecule with an uneven distribution of electrons, which results slight electrical charges within the molecule is called this.
What is a polar molecule?
The force applied to an object divided by the area over which it is applied.
What is pressure?
The general weather conditions prevailing in an area over a long period of time.
What is climate?
This is an unstable isotope that decays to become another atom.
What is a radioactive isotope?
A method of dating organic material by measuring the amount of radioactive carbon-14 remaining in the material.
What is carbon-14 dating?
The attraction between molecules at the surface of a liquid produces this.
What is surface tension?
This unit measures the amount of a chemical of interest found per million units of a mixture.
What is parts per million or ppm?
The day at which the sun reaches its maximum or minimum height in the sky.
What is the solstice?
Radioactive decay in which a neutron emits an electron.
This type of event occurs when a large percentage of animals go extinct over a short geological time period.
What is mass extinction?
A weak chemical bond between hydrogen and another atom is this type of bond.
What is a hydrogen bond?
The reduction of the ocean's pH due to increasing carbon dioxide in the air.
The smallest unit of a storm-producing system.
What is a storm cell?
In alpha decay, a nucleus ejects two neutrons and two protons, a bundle also called this.
What is an alpha particle?
The process by which traits that make an organisms more likely to survive and reproduce are preserved in subsequent generations, while traits that do the opposite are no preserved is called this.
What is natural selection?
A state of balance between opposing actions.
What is equilibrium?
This separates the mesosphere from the thermosphere.
What is the mesopause?
If a tropical cyclone forms in the Atlantic or Northeast Pacific Ocean, it is called this.
What is a hurricane?
The process by which radioactive decay is used to determine the age of a specimen.
What is radiometric dating?
The abrupt appearance of many different kinds of animals in a short period of time during the Cambrian Era refers to this.
What is the Cambrian Explosion?
The movement of molecules from a region of high concentration to one of low concentration.
What is diffusion?
The ions found here can interact with high-energy particles coming from the sun to produce brilliant light shows, called auroras.
What is the ionosphere?
If a tropical cyclone forms in the Northwest Pacific Ocean, it is called this.
What is a typhoon?