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Arte-miy333 [17]
2 years ago
8

How are radioactive isotopes used to determine the absolute age of igneous rock

Geography
1 answer:
Sonbull [250]2 years ago
5 0

Answer:

Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.

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Preston's clock produces 45 useful energy units for every 100 units of electricity used. What is the efficiency of the clock? 0.
lana66690 [7]

The correct answer is - 45 percent.

Since the clock produces 45 useful unites energy units for every 100 unites of energy that it uses, than it turns out that the efficiency of the clock is 45 percent.

8 0
3 years ago
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Geologists have shown that the east coast of the United States faces a serious tsunami threat from ________.
Andrej [43]

Answer: A. Large earthquakes offshore of Portugal.

Explanation:

Large earthquakes in coastal areas can cause tsunamis, an example of which being the boxer day tsunami in 2004.

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How many sq cm are in 52 sq m?
kati45 [8]

520000 sq cm

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True or False: Members of the Wampanoag tribe helped the colonists survive.
Alexxandr [17]

Answer:

True, members of the Wampanoag tribe helped the colonists survive.

Explanation:

When the colonists first arrived in what is now Massachusets, they didn't really know what they're facing and were simply not aware of the conditions in the area and how to survive long term. This was a big problem because the reason why they moved there was because of searching for new opportunities and by not surviving this wouldn't have happened, while the government had its goal on long term settlements through which it will increase its influence in the region.

The reason why the colonists, referred to as Pilgrims, survived were the members of the native Americans, namely the Wampanoag. The Wampanoag were friendly and they explained to the colonists what they can expect climate-wise, thought them about the characteristics of the land, introduced them to local crops and how to grow them so that they can feed themselves. This led to good and friendly relations between the two groups and the colonists survived and managed to remain in the area.

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3 years ago
Question 1: Years ago in this arena gladiators battled, Christians were fed to lions, and ships fought naval battles in the floo
Ivanshal [37]

C and C.

Colosseum and found in Paris, France

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