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geology

Geology is the study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them. It includes the study of organisms that have inhabited our planet. An important part of geology is the study of how Earth's materials, structures, processes and organisms have changed over time. What Does a Geologist Do? Geologists work to understand the history of our planet. The better they can understand Earth’s history, the better they can foresee how events and processes of the past might influence the future. Here are some examples: Geologists study Earth processes:    Many processes such as landslides, earthquakes, floods, and volcanic eruptions can be hazardous to people. Geologists work to understand these processes well enough to avoid building important structures where they might be damaged. If geologists can prepare maps of areas that have flooded in the past, they can prepare maps of areas that m...
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Mona Khalidi

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Mona khalidi is the Assistant Dean of student affairs and the Assistant Director of graduate studies of the school of international and public affairs at Columbia University. She married to Columbia University historian Rashid Khalidi. She work in Wafa agency late 1970's and early 1980's,  Wafa is official news agency of Palestine liberation organization. Mona khalidi is president of the Arab American Action network, an organization that acts as an advocate for Palestinian issues and for women issue. She is well-known personality
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pigeon post.

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Earliest messages were torches, bonfires and smoke signals. But these were in adequate for longer messages letter services have existed for centuries. But they were slow. News of the victory at the battle of Waterloo in 1815 first reached London in hours by pigeon post. 
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