I think its a. Sao Paulo and New York..
Answer:
yess
Explanation:
China has extensive deposits of coal, oil and natural gas. Besides these fossil fuels, China is a top producer of aluminum, magnesium, antimony, salt, talc, barite, cement, coal, fluorspar, gold, graphite, iron, steel, lead, mercury, molybdenum, phosphate rock, rare earths, tin, tungsten, bismuth and zinc.
According to lecture, archaeologists might have to choose between saving everything vs. only saving diagnostic artifacts, which can be analyzed.
What is diagnostic artifact?
- Changing technology has created a vast number of artifacts that mark specific time periods in archeology. These are called diagnostic artifacts because they allow archeologists to pinpoint relatively specific time periods during which they were produced.
- Archeologists studying prehistoric cultures use stone and bone tools to understand technological changes and assign approximate dates to sites.
- Historical archeologists have found increasingly detailed ways to partition time on their sites.
- For example, archeologists can date a glass bottle based on attributes that demonstrate how it was made. A hand-blown wine bottle made of thick, olive green glass is much earlier than a machine-molded medicine bottle made of clear glass and embossed with the manufacturer's name and logo.
- Documented patterns in manufacturing technology allow archeologists to determine the absolute dates for most glass bottles, ceramics, nails and other artifacts found at historic sites.
To learn more about artifacts : brainly.com/question/17362933
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Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years
Where, k is rate constant
So,
The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount ![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D)
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,
So,
<u>The rock is 3.75 billion years ago.</u>
