Describe the pros and cons of the following energy types, writing 1 paragraph for each:
fossil fuel: oil, natural gas, and coal
nuclear energy
solar energy
wind power
water (hydro) power

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

Stages 1 and 4 of the demographic transition are similar in that

What is the approximate chemical composition of the solar nebula?