Organic sedimentary rock forms from which of these?
A. cooling magma
B. things that were once living
C. fragments of igneous rock that are pushed
together
D. fragments of feldspar and silica

Distance that lewis and clark traveled from st. louis to ft. clatsop near the pacific ocean.

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 %.

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.