Which of the following is an example of a chemical change that occurs during weathering? O Freezing and thawing of water in the cracks of rocks
O Animals dig a hole in the ground looking for worms
O Flowing water smooths rock surfaces in a river
O Acids from the lichens growing on the rock breaks down the rock into soil

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.