Answer:
Potassium argon dating
Explanation:
Potassium argon dating is a method used in determining the origin of a rock. I is done by comparing the ratio of radioactive argon to radioactive potassium in the rock. This method is used to date rocks that are thousands of million years old.
the assumptions made when using the Potassium argon dating include :
- no argon was left after formation of the rock
- no argon has either entered or escaped the sample since it was formed.
Siberia is much colder than Western Russia because ocean winds cannot reach Siberia. This wind is warm, which makes Western Russia warmer than Siberia.
Another factor is that Siberia has huge mountainous region preventing warm air from traveling North while cold Arctic air travels South.
Explanation:
The Cenozoic period saw the demise of non-avian species of dinosaur and the emergence of humans. It is characterized at the late cretaceous period period of other main species and the end of the Pleistocene Epoch by the Cretaceous-Tertiary mass extinction event. The age of fresh start however is in this era.
Answer:
Explanation:
Now imagine you were sailing with Ferdinand Magellan, who led the first group of ships to circumnavigate the Earth. Look up “circumnavigate” if you’re unsure what it means. Now imagine you leave Spain, and you head South toward the bottom of South America. Every night on the boat, you look at the stars. What would Polaris be “doing” from night to night ? What happens when the boat crosses the equator ?r
Answer:
Threats to the Great Lakes' ecosystems, include invasive species, climate change, pollution, and habitat destruction. Climate change affects water temperatures, weather patterns, and lake levels. Pollutants from residential, agricultural, and industrial areas reduce water quality.
Explanation:
