Driving on the 87 Octane yields 20 mpg so the driver is able to pass 200 miles for $31.00 dollars and the cost per mile will be $0.16. The example above is simplified but shows that even though the entry cost is lower and in the end, the gas will end up costing more.
Weathering of rocks is caused by chemical and mechanical means, and the types of weathering are therefore generally classified as chemical or mechanical (also known as physical).1  Slightly acidic rainwater can react with rock surfaces, dissolving them over time.ockhound. Weathering of rocks is caused by chemical and mechanical means, and the types of weathering are therefore generally classified as chemical or mechanical (also known as physical). 1  Slightly acidic rainwater can react with rock surfaces, dissolving them over time.
Types of Chemical Weathering. There are three basic types of chemical reactions that cause four types of chemical weathering of rocks. Dissolution and hydrolysis are caused by reactions with acids. Hydration is the absorption of water. Oxidation is reaction with oxygen. 1.Acid Reactions. Acids are chemical compounds that produce H ions when dissolved in water. The stronger the acid, the more H ions they produce.issolution and hydrolysis are caused by reactions with acids. Hydration is the absorption of water. Oxidation is reaction with oxygen. 1. Acid Reactions. Acids are chemical compounds that produce H ions when dissolved in water. The stronger the acid, the more H ions they produce.