The causes and effects of acid rain.
A free CK-12 account is required to view all materials.
The causes and effects of acid rain.
A free CK-12 account is required to view all materials.
Understand the make-up of and effects of acid rain.
A free CK-12 account is required to view all materials.
Explains how natural selection favors certain traits in a population so that the organism adapts to its environment, and that changes in the genes over time cause evolution.
A free CK-12 account is required to view all materials.
Overview of the basic concepts behind evolution, such as gene variation and adaptations.[Free Registration/Login may be required to access all resource tools.]
A free CK-12 account is required to view all materials.
Summarizes the key points about adaptations, mutation, evolution, and natural selection. Includes a few questions to check for understanding.
A free CK-12 account is required to view all materials.
How scientists have been able to determine the age of Earth.
A free CK-12 account is required to view all materials.
How scientists have been able to determine the age of the Earth.
A free CK-12 account is required to view all materials.
A quick review of the age of the Earth.
A free CK-12 account is required to view all materials.
How advances in agriculture have been able to sustain larger human populations.
A free CK-12 account is required to view all materials.
Reveals how human population growth has paralleled advances in agriculture, such as the advent of agriculture, and the onset of the Green Revolution.
A free CK-12 account is required to view all materials.
Summarizes the key points about the evolution of agriculture and how it has impacted human population growth. Includes a few questions to check for understanding.
A free CK-12 account is required to view all materials.
Get a quick overview of air masses and their movement.
A free CK-12 account is required to view all materials.
Presents information on the compounds that pollute the air, their sources, and the regions in which air quality is chronically bad.
A free CK-12 account is required to view all materials.
A quick overview of air quality and pollution.
A free CK-12 account is required to view all materials.
Describes characteristics of asteroids.
A free CK-12 account is required to view all materials.
Describes characteristics of asteroids.
A free CK-12 account is required to view all materials.
Summarizes the key points about atmospheric processes involving air pressure, air density, and temperature. Includes a few questions to check for understanding.
A free CK-12 account is required to view all materials.
Examine the composition of matter.
A free CK-12 account is required to view all materials.
Understand the basic structure of atoms and molecules in the Earth's crust.
A free CK-12 account is required to view all materials.