On the medieval world-maps it was represented only the part of the world known as the 'old world', which is consisted of Europe, Asia and Africa. Before the big discoveries, people living in this continents had knowledge only of this part of the world, while South and North America, Australia and Antarctica where still unknown to them, thus they are missing in the world-maps of this period.
It would be sonar i think
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 reddish-orange colour of weathering of volcanic ash is most likely due to its iron sulfide content which oxidizes to iron oxide so that limonite is yellow and hematite is red and in ash since it is such fine grained material it weathers more rapidly because it has a large surface area.
