Humans (the genus Homo) are believed by most geologists to have been around for only about __________ years of Earth’s history.
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The most common rocks in Earth’s crust are
The most common rocks in Earth’s crust are
Latitude is the angular measure in degrees __________.
Latitude is the angular measure in degrees __________.
The hollow depression left when a shell or bone is dissolved…
The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n)
The shortest distance between two locations on the surface o…
The shortest distance between two locations on the surface of the Earth is the arc length along __________.
Amber is fossilized
Amber is fossilized
The element that is most abundant in Earth’s crust is
The element that is most abundant in Earth’s crust is
The Paleozoic era ended with an event called the
The Paleozoic era ended with an event called the
The two elements silicon and oxygen, taken together, make up…
The two elements silicon and oxygen, taken together, make up about what percent of Earth’s crust by mass?
Sediments are classified according to the source of their co…
Sediments are classified according to the source of their constituents into two main groups. One is chemical. What is the other?