The planets appeared to move backward in the sky occasionally.
<span>If I were attempting to date a rock sample that I suspect to be incredibly old, i would use radioactive isotopes with a long half life. When dating rocks and fossils to discover approximately how old they are, radioisotope dating is used on igneous rocks found near fossils. Things like Uranium 235, which is an unstable radioactive isotope of elements, decays at a constant rate over time so can be useful in determining age.</span>
Answer:
<h2>Secondary air pollutants are pollutants which form in the atmosphere.</h2>
Explanation:
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.
Answer:Biomagnification
Explanation:Cause it’s right fella
The recommendation of health professionals is to drink 8-10 glasses of water daily. But this is dependent on the climate and the activity the person is engaged into. For instance, an athlete who is training needs to drink more water to replace all the water lost in his body during training than compared to a person not training or exercising.
