Free points - 1) write 3 trillion in expanded form 2)what day is christmas on 3)how was ur answer all 3 mkdnmkdkd adios

The valve seat performs two functions: it provides a seal for the valve in the combustion chamber, and it provides a cool surface to carry heat away from the valve. most valves use a seating angle.

Physical needs include: a. the need for sleep b. the need to feel safe c. the need to feel secure d. all of the above

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.