Answer:
The true statement is option D. The two major factors determining the Earth's temperature are the Earth-Sun distance and the concentration of oxygen in the atmosphere.
Explanation:
The distance between the sun and the Earth is one of the factors that determines the temperature of the planet. The energy from the sun travels to the Earth, increasing the temperature.
The other fact that has a role in the Earth's temperature is the concentration of oxygen in the atmosphere. It can increase or decrease the temperature according to the amount of this. Oxigen contributes to the greenhouse effect, which helps to keep the temperature in a range that allows life to happen.
Answer: Pastoral nomads
Explanation: Pastoral nomads are producers of food, and the size of their tribal or ethnic units increases accordingly. These groups raise livestock, and they move about within their established territory to find good pastures for their animals.
Answer:
A
Explanation:
The physical environment has a massive effect on human activities. Throughout history the impact of the effect of the physical environment has changed, but the influence has always been there. Some ways in which the physical environment affect humans are:
- weather and climate
- natural disasters (volcanic eruptions, earthquakes, tsunamis)
- terrain
Human activities also have a significant impact on the physical environment. Some examples of ways that humans affect the physical environment are:
- deforestation
- extraction of resources
- anthropogenic climate change
- modification of topography
- contamination of the seas
The statement is correct.
The contour lines are a very good indicator of the relief. The closer they are to one another, the steeper the relief, and vice verse, the more distant they are from one another, the flatter the relief is.
In general, contour lines that are very close to each other can be noticed on the mountains, as most of the mountains have steep parts, or rather steeper slopes.
The more distant contour lines, on the other hand, can be found on places like the valleys or the plateaus, places that in general are much flatter.
