Half-life is used to determine the age of the material
<h2>Explanation</h2>
The radioactive materials are always in the state of decay by losing their energy in the form of rays. The term half-life is used to measure their age after the specific time. Half-life is actually the time which is taken by the radioactive materials to reduce half its initial value and use to measure the age of elements. It is donated as t1/2.
For example, 10 g Barium-139 takes 86 mints to convert int 5g Barium-139 and 5g Lanthanum-139. This time of decay is different in the different element and tells their age after the specific time period. So, the right option is (1).
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Convection in the mantle and pressure of magma on the edge of the plate
Explanation:
Convection currents occur in the mantle because the upper mantle (asthenosphere) is generally cooler than the lower mantle. The convections apply upward pressure on the lower edges on the lithosphere as the melted rocks upwell from below. The lithosphere deflects the convections and as the convections churn clockwise of anticlockwise, they drag the lithosphere with it via friction. This is what is stipulated to cause tectonic plate movements.
local time vs standard timeLocal time implies the time of a particular country, as regards the meridian running through it. On the contrary, standard time is referred as the official local time of a region ascertained by the distance from the Prime Meridian of the meridian running through the area. Here we’ll break down the significant differences between local time and standard time.
La llegada de la corriente del Niño es considerada beneficiosa porque anuncia la temporada anual de lluvias, necesaria para la agricultura y el ciclo biológico del bosque seco ecuatorial.
