The Harappa’s system of standardized weights and measures signified advance technology and an advancing civilization in the Indus River Valley. Remarkable accuracy in systems and tools of the Harappan people were demonstrated by fire-baked bricks which were consistently moisture resistant and uniformly sized.
Lapita and then Polynesians. :) Hope this helped.
Answer:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Explanation:
The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (
), in grams, is described below:
(1)
Where:
- Initial mass, in grams.
- Time, in years.
- Time constant, in years.
The time constant can be found from half life (
), in years, described in statement:
(2)
If we know that 
, 
and 
, then the current amount of the sample is:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Answer:
23.5º
Explanation:
The Earth has a tilt of 23.5 degrees on its axis. This tilt causes the seasons because certain parts of the Earth are naturally tilted towards the Sun more depending on the Earth's location in its revolution around the Sun. The Tropics of Cancer and Capricorn are located at 23.5º North and South of the equator respectively, and this number comes from the tilt.
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