The following table shows the currently accepted half-life values for six parent isotopes. parent isotope currently accepted half-life values uranium-238 4.5 billion years uranium-235 704 million years thorium-232 14.0 billion years rubidium-87 48.8 billion years potassium-40 1.25 billion years samarium-147 106 billion years earth is approximately 4.5 billion years old. given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? potassium-40 rubidium-87 samarium-147 uranium-238

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Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

What is the relationship between wind and ocean waves? question 17 options: wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves. wind moving at higher speeds will transfer energy over a larger part of the ocean water, resulting in waves with a shorter wavelength. winds moving at higher speeds with cause water to move forward at faster rates, causing larger ocean waves. winds moving at higher speeds will affect deeper water, resulting in waves that move at a faster rate. how do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.