Answer:
The layer of greenhouse gases is permeable to one side and not permeable to another side.
Explanation:
Greenhouse gases such as carbondioxide, methane and water vapors etc formed a layer which allow the sun radiation to the earth surface but when these radiation reflected back, this layer traps these reflected radiation and the radiation remain suspended in air which heat up the particles present in the air and increases the temperature which causes global warming of earth surface. This phenomenon is also called greenhouse effect and it is also very useful in growing crops in cool seasons. So this layer is permeable from one side and not permeable from another side.
Option B (Sudan)
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Answer:
<u>Relative dating</u>
Explanation:
Usually the age of formations of a rock is categorized in a geologic time scale.
There are two different types of geologic time scale;
a. Relative dating sequence
b. Absolute dating sequence
The correct sequence from bottom to top is the relative time dating. The Relative dating shows rock ages in their order of occurrence (from Bottom to Top).
These are examples of relative dating sequence:
- Superposition,
- Crosscutting Relationships,
- Sequence from bottom to top,
- Inclusions,
- Faunal Succession.
When building some infrastructure, in this case a railway, that is close to a mountain slope, it is necessary to cover the mountain slope with a wire mesh.
The biggest reason for that is the safety.
The steep mountain slopes can be very dangerous, because the rocks undergo the natural processes of weathering and erosion, which causes the rocks to break up and fall downwards. The railway can be locked in that way because there will be rocks on it, so the trains will not be able to pass further. But what is more concerning is that rocks may start falling directly on the train itself, or on the railway but when the train is passing through, and can cause a tragedy. The train may get pushed of the railway, or the rocks may knock it down or get through the windows, so lot of lives can be lost, as well as lot of damage will be done too.
