The greenhouse effect becomes a problem

a. when there is an increase in solar radiation.
b. when there is an increase in the amount of greenhouse gases in the atmosphere.
c. when green plants produce too much oxygen, increasing the amount of oxygen in the atmosphere.

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?