Unlike fossil fuels, solar energy is considered nonpolluting because the chemical and radioactive products of solar fusion
A) stay near the sun.
B) are destroyed in Earth's atmosphere.
C) would be produced on Earth anyway.
D) quickly break down when they strike the Earth's soil.
Question 2
The most stable predator-prey relationships typically involve communities in which there are
A) many prey species and several natural predators.
B) many species of carnivores eating each other.
C) only bottom-up population regulation.
D) only top-down population regulation.
Understanding the Solar System
A recently discovered fossil of a missing evolutionary link is shown on the right, and a ...
The U.S. military uses its own marking system to identify explosive hazards (left), chemical hazards ...
Hydrogen burns to produce energy and water
Energy Use by Different Country Groups
Physics: Power, Energy and Time