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WorksheetsEarth's History Review
Total questions: 15
Worksheet time: 9mins
What era includes the emergence of the first flowering plants?
(USE the chart)
Paleozoic
Cambrian
Cretaceous
Tertiary
Earth formed approximately ___ billion years ago.
3.5
4.6
5.7
6.8
_________________________are scientists who study fossils.
botanists
demographers
fossologists
A type of organism that no longer exists on Earth is said to be ____.
fossilized
sedimentary
extinct
petrified
The time it takes for one half of the atoms in a sample of a radioactive element to decay is called the element’s _________________________.
decomposition
power loss
lifespan
Fossils are mostly found in:
Igneous rock
Molten rock (magma)
Sedimentary rock
Saltwater
What life forms were responsible for first introducing oxygen into Earth’s atmosphere?
The very first life forms on Earth
Photosynthetic cyanobacteria
The first multicellular organisms
The first land plants
What is a fossil?
A living organism
The organic matter that makes up an organism
Preserved remains or evidence of a once living organism
A type of rock
The diagram shows a cross section of some sedimentary rock with some fossils in it.
Assume that the rock layers have been preserved in their original sequence, which fossil is probably oldest?
Multi-cellular Eukaryotes
Dinosaurs
Single-Celled Prokaryotes
What is an example fossil?
a preserved skeleton
an imprint of a leaf
a shell
all of these
What did Miller and Urey successfully chemically produce when recreating early Earth's conditions in the lab?
DNA
Amino Acids
Cells
Bacteria
Which of these was occurring at the same time as early humans?
A major Ice Age
The Dinosaur Ages
"Snowball Earth" (Rodinia)
Pangea
Scientific estimations of Earth's Age are mostly based on...
religious writings
ocean floor maps
dinosaur fossils
radiometric dating
