Answer:
D
Explanation:
you have to make groupes.
start with a² part and forget the rest from example.
-4a²-a²=? Now remember - and - is adding up. so -5a², which takes out options a and b, as there are 3a² instead of 5.
now let's take ab part and forge the rest.
-2ab+6ab=? that gives us 4ab. So option c, which says 8ab, is wrong. the last number isn't really important in this case because you've already seen the rest can't be.
Weathering is process by which rocks are broken down by natural climate, this is called weathering.
Three factors that influence weathering are:
- Climate: Due to sudden change in climate weathering occurs.
- Human activities: Burning of coal, petroleum and dumping acids in places which erodes the rocks.
- Animals: When birds search for worms and make hole in the soil. Which erodes the upper portion of the soil which then leads to weathering.
Answer:
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Explanation:
- <em><u>Macroeconomics is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole. For example, using interest rates, taxes, and government spending to regulate an economy’s growth and stability. This includes regional, national, and global economies. Wikipedia</u></em>
- <em><u>Macroeconomics is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole. For example, using interest rates, taxes, and government spending to regulate an economy’s growth and stability. This includes regional, national, and global economies. WikipediaMicroeconomics is a branch of economics that studies the behaviour of individual units such as households, individuals and enterprises within the economy. ... Microeconomics uses demand and supply as tools of analysis to study the decisions of individual entities in the economy.</u></em>
In most cases, as altitude increases, the air in the troposphere cools. Vertical mixing occurs as a result of warm air rising. However, a layer of cool air may form beneath a layer of warm air on occasion. Temperature/thermal inversion refers to this deviation from normal temperature.
When an inversion occurs, polluted areas (such as London and Donora PA) experience unhealthy air and an increase in smog because pollutants are trapped at ground level rather than circulating away.
