The fault is younger than the lower rocks but older those above it.
Explanation:
A fault found that cuts through lower rock layers but not those above it suggests that the fault is younger than the lower rock but older than those above it.
This interpretation is based on the principle of cross-cutting which states that "an intrusion or fault is younger than the rocks they cut through".
- In essence, an intrusion or fault cannot cut through a rock sequence unless it is already in place.
- This is why the fault that cuts through the rock layers is younger than the rock layers.
- But since it did not pass through the layers above, it is older than it.
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Since 1970, fertility rates have declined in both more developed and less developed countries.
Explanation:
The fertility rates have had some big swings, both up and down in the past century. Everyone is familiar with the ''baby boom'' period, when the fertility rates around the world all skyrocketed, which resulted in rapid growth of the global population. This all started to change though, and from the 1970's onward the fertility rates have started dropping and still do.
It is not just the developed countries that experience this trend, but the less developed as well. The differences is mainly that the developed countries have fertility rates that are below the sustainability point, while the less developed still have relatively high fertility rates and their population still grown. In the manner in which things are going, it is expected that the global population will stop growing in about two or three decades.
Countries that have low fertility rates are:
Countries that have relatively high fertility rates are:
- Zimbabwe
- Pakistan
- Bangladesh
- Nigeria
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New land, more resources, and the spread of Christianity
