Answer:
The country's poorest and least developed region is the semi-arid North-East. This region has historically had the single largest concentration of rural poverty in Latin America, with more than half of the total population and three quarters of the rural population being poor. Low income. mainly the big cities in south-east Brazil. the ranking of cities is being followed by the graph.
Explanation:
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.