Answer:
The presence of iridium in concentrations higher than 100 times the normal in the Cretaceous–Paleogene (K–Pg) boundary supports the Alvarez Impact Hypothesis.
Explanation:
Father and Son Alvarez argued that since iridium is present in extremely minute quantities on earth, its presence in very high concentrations in this layer which is thought to date back to 66 million years is evidence that an extraterrestrial impact took place which brought the iridium. The high destructive nature of the impact spread the iridium far and wide which deposited on the surface which is why it is present in this layer which dates back to that period.
Answer:
A and C
Explanation:
A and C I believe are the correct answers and at least with these the time frame given matches up. The Pontiac's Rebellion began in 1763 so it would have changed things after that period of time. And the Great Awaking took place during the 1730s and 40s.
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Frozen part of earth's hydrosphere is made up of ice:glaciers,ice caps and icebergs.
97.5% of the hydrosphere is saline water.
oceans, lakes, pools and puddles, underground water etc.
