Answer: R<span>ock samples.
Explanation: Geologists studied and told us that the Earth's crust is composed of various chemicals, minerals, and rock samples. Even the chemicals and minerals are obtained from within the rock samples. Minerals are to rocks such as vegetables are to the salad. These minerals are extracted and processed by geologist and such rock which contains traces of minerals are called ores. </span>
ANSWER:
Pressure changes that occur in Darwin are positively affiliated with air pressure changes that occur in other areas of the world.
The unconformity that is found in a geological cross section indicates that in this area erosion happened.
Erosion is a natural process in which the surface of the Earth (<span><span>soil, rock, or dissolved material</span>) gets worn down.
The cause for erosion can be wind, water, glacier ice or other natural element.
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The best answer to go with is b
