A rock on the oldest Hawaiian island is found to around 65 million years old when using two different dating techniques.
One group of scientists used Sm-146 and found about 95%
of the element had decayed over that time frame. A separate
group used potassium-40 and found only about 10% of the
potassium had decayed over that same time frame. What
could cause these two measurements to be different? How could these two different elements date the same rock to
the same age?

At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box