The emperors and empresses convoked religious councils, which had to make a decision. These councils were convoked only to solve issues caused by the Iconoclast Controversy.
Most landforms change very slowly over many, many years. New mountains have formed as the plates of Earth's crust slowly collided, and others have been worn away by weathering and erosion. ... Floods and landslides can change landforms in a matter of seconds. Volcanic eruptions can also change landforms quickly.
It's an original document, original documents like journals and treaties are examples of a primary source.
Answer:
100 years
Explanation:
All the ruling houses have a span of over 100 years. A interval spacing of just 5, 10, or 20 years would be a waste considering how long these time periods are.
Option d
they wanted to explore and chart the coasts of Asia and Africa
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