Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
Note: This information has been taken out of a website.
Answer:
Movements along faults can make it harder for geologists to determine the relative ages of rock layers.
Explanation:
The absolute age of a sample is its age in years. This method of determining absolute age is called radiometric dating, and it involves the decay, or breakdown, of radioactive elements. Using radiometric dating, scientists can determine the actual age of a rock.
Answer:
Jet stream
Explanation:
Jet stream is fast moving air or wind that blows horizontally through the upper layers of the troposphere, generally from west to east. It develops where air masses of different temperatures meet. The greater the difference in temperature, the faster the wind speed.
Jet stream has the following characteristics;
- The winds blow from west to east
- The flow often shifts to the north and south.
- They follow the boundaries between hot and cold air.
Answer:
B - sub-Sahara Africa
Explanation:
this region is already very dry - there has been over grazing of animals - deforestation that speeds up desertfication
It's gets colder, wetter, and not much sun is received.
