Biofiltration
Biofiltration uses sand filters, contact filters or trickling filters to ensure that any additional sediment is removed from the wastewater.
Aeration
Aeration is a lengthy process which increases oxygen saturation by introducing air to wastewater. Typically, the aeration process can last for up to 30 hours, but it is very effective.
Oxidation ponds
Typically used in warmer climates, this method utilises natural bodies of water such as lagoons, allowing wastewater to pass through for a set period before being retained for two to three weeks.
Not sure if that’s what you mean
EUROPE
Major reduction in cropland has been noted due to afforestation and urbanization. The growing of grasslands and forests as well as building of cities have slowed down the conversions of spaces into croplands.
The EU is working on the decline slowly but us determined to succeed in establishing croplands.
Answer:
Energy is being created naturally.
Explanation:
For example:- Every living being get energy by food.
The quote you put there means energy can not get created or get destroyed in lab.
Antarctica would have flora and fauna very different from Sahara - so we can exclude this option. Also, Sahara doesn't have ice sheets - so we can exclude option c too.
The correct answer is d- deserts are usually defined in their relatively low level of precipitation.
The best answer in my opinion is B. similar border laws because the border between america and canada has been shared for over 200 years and it is known as the international boundary. I would think this is the logical answer out of the choices given. If I am wrong I apologize let me know.
