Nov. 8 test review questions 15-20 Flashcards
What are the order of the four eras?
Precambrian, Paleozoic, Mesozoic, Cenozoic
Which era lasted the longest?
Precambrian era
Which era are we living in?
Cenozoic era
What did the Canadian shield look like originally?
Really tall mountains
What does the Canadian shield look like now?
It looks like there’s lots of trees, rocks, hills, lakes, rivers, etc.
How did the Canadian shield change?
well, there’s no mountains anymore…I mean you can just look at it, but I guess that’s a difference
Where was the eroded material deposited and what did it become? from the Canadian Shield
It was deposited onto either side of the mountains, the western plains and the eastern lowlands. It became sedimentary rocks
How are igneous rocks formed?
Igneous rocks are formed when you cool off magma. An example of this is granite
How are metamorphic rocks formed?
They’re formed when igneous or sedimentary rocks are subjected to heat pressure and certain fluids ex. shale to slate
How are sedimentary rocks formed?
They’re formed when loose sediments come together and get compressed into a sedimentary rock. An example of this is sandstone.
Explain how an igneous rock can become a metamorphic rock
When magma or fluids are forced into cracks in existing igneous or sedimentary rocks.
explain how a sedimentary rock becomes a metamorphic rock
when magma or fluids are forced into cracks in existing ignsous or sedimentary rocks.
explain how a metamorphic rock becomes an igneous rock
it melts and then cools off
explain how an igneous rock becomes a sedimentary rock
it erodes and then compresses together
explain how a metamorphic rock becomes a sedimentary rock
They change when they are subjected to heat, pressure, and certain fluids.
