Why is coal costly to produce?
1.coal is found deep underground.
2. coal is expensive to make
3. coal is only found in certain places on earth.
4. coal is difficult to make in the lab.

The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy is nuclear

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.