Earth Sci Ch 30 Vocab: Question Preview (ID: 2449)


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An exposed area of the oldest continental rock, or craton, is called
a) a volcano
b) a shield
c) an eon
d) graptolite

What is the name of a sea scorpion that lived in the Silurian period?
a) crinoid
b) ammonites
c) dinosaur
d) eurypterid

Mats of cyanobacteria that formed domes in Precambrian time are called
a) trilobites
b) stromatolites
c) graptolites
d) foraminifera

A crablike invertebrate that is the most common fossil of the Cambrian is called
a) a trilobite
b) an eurypterid
c) dinosaur
d) hominid

A modern human or a recent human like ancestor is called
a) a foraminifera
b) an ammonite
c) a hominid
d) crinoid

The longest segment of geologic time is
a) a period
b) an epoch
c) an eon
d) an era

Main divisions of an eon are divided into
a) period
b) epochs
c) eras
d) hours

Eras are divided into
a) eons
b) periods
c) epochs
d) days

Ancient plant-looking creatures related to seastars are called
a) foraminifera
b) crinoids
c) eurypterids
d) trilobites

Ancient tiny animals that lived in oceans & are good index fossils are
a) trilobites
b) graptolites
c) eurypterids
d) crinoids

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