Which are the main causes of crack growth in rocks over time ? ? a. plant roots and ice wedging b. ice wedging and wind abrasion c. animal burrowing and plant roots d. animal burrowing and wind abrasion

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.