The rock is a Sedimentary rock. Sedimentary rock is made up of different types of remains like shells, bones, etc.
Answer:
A letter is a primary source
Explanation:
If Abraham Lincoln were to write a letter it would be considered a primary source because of Lincoln having been there to experience and be apart of it. Whereas an article by a journalist describing what happened during the time the letter was being written would be a secondary source for the journalist wasn't there.
Hope this helps!
The people of Earth face many problems
Struggling just to live and maintain peace.
There's differences in language, faith and race
With misguided hated unwilling to cease.
To solve these problems that plague mankind
We must strive as never before.
Demanding justice with truth in settling disputes
While recalling the loss and heartbreak of war.
War is an emotional release for man
Practiced since the first stones were cast.
Could it be nature's way of thinning the numbers
As the fallen are consumed by the past.
Some have asked why must we study history
It just encourages us to live in the past.
When we forget God and submit to whatever
The sorrows of our sins forever last.
Answer: C. arrival of invaders.
Outside pressures were especially problematic for the Byzantine Empire, in particular, the arrival of invaders. The most important of these were the Ottoman Turks. By 1373, Emperor John V was forced (as were the Serbian princes and Bulgarian rulers) to become a vassal of the Turks due to the failing economy of the empire and their inability to defend themselves. The rise of Murad II as a sultan proved even more challenging to Byzantium, as he laid siege to the city. Finally, his successor, Mehmed II successfully conquered the city in 1453.