1. A nuclear equation represents_________processes such as_____________ .
Options:
- neutron
- radioactivity
- structure
- catalysis
- mass
- various
- numbers
- nuclear
- equal
- reduction
2. A layer of peat beneath the glacial sediments of the last ice age had a carbon-14 content of 25 % of that found in living organisms. How long ago was this ice age? Express your answer using four significant figures.