They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
Answer:
La Paz is a bit more densely populated than Lima, since the former has a population density slightly higher than this of latter.
Explanation:
In this case, we need to know the populations and occupied area of the city. By definition, population density is the ratio of the population of the city to the occupied area in the same location.
The required information is gathered below:
La Paz (Bolivia)
Population: 1.801 million (Metropolitan area)
Occupied area: 475 square kilometers.
Population density: 3792 inhabitants per square kilometer.
Lima (Perú)
Population: 9.674 million
Occupied area: 2672 square kilometers.
Population density: 3621 inhabitants per square kilometer.
In this case, La Paz is a bit more densely populated than Lima, since the former has a population density slightly higher than this of latter.
Because of Earth's axial tilt (obliquity), our planet orbits the Sun on a slant which means different areas of Earth point toward or away from the Sun at different times of the year. Around the June solstice, the North Pole is tilted toward the Sun and the Northern Hemisphere gets more of the Sun's direct rays.
Answer:
Quartz is not pure in this rock.
Explanation:
When quartz shows effervescence in contact with an acid, it means that it is not in its pure state, but rather related to other substances that may be cementing the quartz. This effectiveness is caused by substances that do not react like quartz, such as calcite.
In this case, we can conclude that in relation to the calcium-rich rock shown in the question above, the calcium is not pure, but it is likely to be related to calcite, or other material that does not react to acid.
