Scientific Method
After making an observation, scientists need to do ____.
research
This substance, crucial to modern species' survival, did not exist in the early atmosphere.
oxygen
An initial action leading to more of that action occurring is a ____ feedback.
positive
Earth's _____ produces seasons.
tilt
Scientists use a hypothesis to help them set up an _____.
experiment
Plant life is important for our survival because they absorb ____.
carbon dioxide
An initial action leading to stabilization of a system is known as a ____ feedback.
negative
The most daylight of the year occurs on the summer ____.
solstice
Getting a sun tan at the beach is an example of this form of heat transfer.
radiation
This variable is manipulated to test a result.
independent variable
These gases help to trap heat in the atmosphere.
greenhouse gases
Earth's weather occurs in this atmospheric layer.
troposphere
During these twice-yearly events, every place on Earth receives around 12 hours of daylight.
equinox
Warm, surface-based air rising to form a thunderstorm is an example of this form of heat transfer.
convection
This variable is actively measured in an experiment.
dependent variable
This plant process led to an increase in atmospheric oxygen.
photosynthesis
The ozone layer is located in this atmospheric layer.
stratosphere
Earth is tilted ___ degrees on its axis.
23.5
Gamma rays, visible light, and radio waves are all types of radiation within the ____ ____.
electromagnetic spectrum
This variable is kept constant through an experiment.
control variable
Mass condensation of water vapor led to the formation of _____.
oceans
This atmospheric layer forms the interface between the atmosphere and outer space.
exosphere
Although Earth's axis is currently "in line" with the position of the North Star, this will change in several thousand years. This is the result of which Milankovitch cycle?
precession
This strongest type of solar radiation impacting Earth's surface is called _____ radiation.
ultraviolet