The mining-resource cycle determines the use of ore materials. which step is not part of the cycle?

a)
exploring and extracting ores
b)
refining ores and creating products from ore materials
c)
marketing and selling products that use ore materials
d)
recycling and disposing of wastes from the steps and the products

Answer:

The marketing and selling products that use ore materials is the step that is not part of the mining-resource cycle                

Explanation:

There are five stages of mining resource cycle are:                

1. Prospecting and

2. Exploring: This includes searching the ores for mining with exploring techniques.                                                                        

3. Developing products from the materials.                                   

4. Extraction: Extracting the products and fine material.            

5. Recycling and disposing wastes from the steps and products. This helps in controlling the industrial wastage and also the mines are used in a completely resourceful manner which does not affect the environment.    

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.