Chemical weathering is the disintegration of a substance in the rock through a chemical reaction.
Carbonation occurs when water and a pollutant, such as sulphur dioxide creates a weak sulphuric acid. When it rains and the water comes into contact with limestone a chemical reaction happens. Calcium sulphate is produced as it takes the calcium carbonate from the limestone. It can then transfer the solution to another area until it evaporates. When it does so it leaves behind calcium information such as stalactites.
hydration occurs when minerals in a rock absorb water, causing it to expand. Mineral, such as anhydrite, expands and weakens it’s structure and leave the rock more exposed to erosion.
oxidation occurs some substances react to being exposed to water or air. Iron, when exposed, will turn from a silver color to a red or dark brown color known as iron oxide. It weakens the rock.
hydrolysis occurs when water bonds with a mineral in the rock. It is particularly strong at weathering feldspars in rock and can lead to the formation of Kaolin.
B (the romans) is the correct answer...
With demand of technology the space exploration advancement is also increasing.
Explanation:
Due to the advancement of technology the demand for the space industry is also increasing. As new technologies have arrived we can go into the galaxies so that we can explore the territories which have not been discovered. Also we come across new phenomena.
As huge investment is done in various government space programme we are now able to achieve our dreams that we we once used to watch in television.
The data that are received are used in various research and development purpose and also helps in predicting when will craft re-enter orbit. Vast data are necessary for the mission .
Pangea is the supercontinent Alfred Wagner proposed in his theory
