Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
Answer:
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This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
Answer:
The equator experiences equal day and night as the summer solstices has longest days in northern side and the winter has longest in the southern side.
Explanation:
- As the summer have the solstice period in the northern hemisphere, the areas in the north gets most of the heat and sun days as that of the southern hemisphere and the reverse is true for the winter solstices that has maximum day in the south and less in the northern hemisphere as sun rays don't pass the 66.5 degrees latitude.
Answer:
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