Answer:
External and Internal forces.
Explanation:
The earth's relief forms such as Mountains, Rivers, Plateaus etc, are changed because of the action of internal and external forces for example; wind, water or human activities.
Until the early Proterozic there were only negligible amounts of free oxygen in the atmosphere
A geologist's job includes determining the history of an area.
Answer: Option C
<u>Explanation:</u>
Geologists are researchers who studies the materials available in the earth about their nature, characteristics and their age. Speaking of the age of the materials it helps to understand the history of the earth, Each area in the earth's history has undergone several civilizations and lifestyles.
Also, it has experienced various natural changes or special space happenings. By working on that with the founded specimens or collected evidence they can create reports. That can help to get a clear understanding of the climatic changes, history and topography of the species are in the world.
The Cinder cones are the volcanic landform that develops from felsic lava oozing out of the ground—often in the crater of another volcano.
It is made from discharged lava fragments that harden in flight to produce scoria or vesicular rock.
