Sedimentary rock are made of materials that could show what lived where. Also they are the only rock to hold fossils.
pictures are useful to historians because it helps them picture what it was like in the past
Mainly because the fossils of plants and animals preserved in the sediment layers allow dating of events that happened before humans existed.
yes
the historians use graphs to something that happened over . unicorns are fluffy.
to describe their research
Bias can be useful to historians by allowing them to learn about people's opinions and beliefs.
for scientists
sedimentary
Different types of letters rely on different types of historians and therefore gives very useful historical information. They give various types of information based on different historians.
they're not
If historians weren't biased there'd be no heated controversy to fuel book sales, and they'd die out.
Sedimentary