Any of the useful minerals and other materials that people take from the Earth

• Natural Resource

• Renewable Resource

• Nonrenewable Resource

• Conservation

• Recycle

A resource that cannot easily be exhausted because it is rapidly replaced by nature (air, water, plants, and animals)

• Natural Resource

• Renewable Resource

• Nonrenewable Resource

• Conservation

• Recycle

A resource that, once exhausted, cannot be replaced in a short amount of time (oil, coal, and natural gas)

• Natural Resource

• Renewable Resource

• Nonrenewable Resource

• Conservation

• Recycle

To protect resources and avoid wasteful and destructive use

• Conservation

• Recycle

• Reuse

• Reduce

An angle that measures less than 90 degrees

• Acute Angle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle

An angle that measures exactly 90 degrees

• Acute Angle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle

An angle that measures greater than 90 degrees but less than 180 degrees

• Obtuse Triangle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle

A triangle where all three angles are less than 90 degrees

• Obtuse Triangle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle

A triangle that has one 90 degree angle and two acute angles

• Obtuse Triangle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle

A triangle where one of the angles is greater than 90 degrees

• Obtuse Triangle

• Right Angle

• Obtuse Angle

• Acute Triangle

• Right Triangle