Which statement is true? hydroelectric power is generated from moving water. oil, a renewable resource, is processed to make jet fuel. propane, a renewable resource, is used in some heating systems. geothermal energy can be converted to electricity in solar cells.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

What are atoms of the same element with varying number of neutrons

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.