The graph below compares the total amounts of greenhouse gas emissions expected for future mid-size cars, including emissions that occur when moving fuels from their original source to fueling stations where people can buy the fuels for their cars. Amounts are shown in grams of CO₂ (or equivalent greenhouse gas) per mile driven by the mid-size car. Which vehicles are the best choices for environmentally friendly cars?
A. fuel cell electric and battery electric
B. hybrid electric and plug-in hybrid electric
C. conventional internal combustion and hybrid electric
D. conventional internal combustion and battery electric

During metamorphic processes, increased pressure and temperature can affect the of minerals in rock. rocks subjected to very high pressure are typically than others because mineral grains are squeezed together, and the atoms are more closely packed. during metamorphic processes, water facilitates the transfer of ions between and within minerals, which can the rate at which metamorphic reactions take place. the growth of new minerals within a rock during metamorphism has been estimated to be about per million years. metamorphism is commonly associated with convergent plate boundaries, where two plates move toward each other. during contact metamorphism, a large intrusion will contain thermal energy and will cool much more slowly than a small one. metamorphosed sandstone is known as the metamorphic rock made from metamorphosed shale, was once used to make blackboards for classrooms.

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

Which characteristics can be used to differentiate star systems? check all that apply.