Ahistorian compares transcripts of speeches delivered by powerful world leaders throughout history. these transcripts serve as what type of sources?

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers

according to my research (britannica and quizlet) the first settlements were along the huang river because it could give the crops more fertile soil that really it out. this was due to the yellow slit caused by floods of the river.