The elements listed in the choices are radioactive materials. These materials are very unstable because of the high neutron-to-proton ratio in the nucleus. Because of this, they spontaneously undergo nuclear reactions by giving off sub-particles in order to lower the ratio. They emit radiation in the form of alpha, beta or gamma.
Half-life is the length of time it needs to completely react half of the original amount. For example, it would take Bismuth 60.5 seconds to use up half of its amount. Therefore, the lower the half-life the faster the reaction is and the lesser the residual amount will be. With that being said, the answer would be Bismuth because it only takes seconds.
No human inhabitants because Polar vortex win lower temperatures in the Antarctic .
Changes in the supply source or sediment supply can begin or end the life of a river.
<h3>What other factors can affect the life of a river?</h3>
Other factors that can affect the life of a river are;
- The kind of rocks present on the shores
- The source and supply of sediments.
Sediments deposited continually on the shores of a river can gradually edge the river away from it's course or cut it off from it's source.
Hence, it is right to state that Changes in the supply source or sediment supply can begin or end the life of a river.
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Continental because my teacher told me that its the most climate place in the central region of Eastern Europe
