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8th grade-chap 13

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1.
1 point
__________ are the remains, imprints, or traces of prehistoric organisms.
2.
1 point
For the most part, the __________ of dead plants and animals disappear quickly.
3.
1 point
_________ eat and scatter the remains of dead organisms.
4.
1 point
Fungi and ___________ invade, causing the remains to rot and disappear.
5.
1 point
Whether or not a dead organism becomes a fossil depends upon how well it is protected from ____________ and agents of physical destruction, such as waves and currents.
6.
1 point
If a fish dies and sinks to the bottom of a lake, __________ carried into the lake by a stream can cover the fish rapidly.
7.
1 point
The body parts then might be ____________ and included in a sedimentary rock like shale.
8.
1 point
Organisms have a better chance of becoming fossils if they have hard parts such as _______, shells, or teeth.
9.
1 point
Most fossils are the hard parts of organisms, such as _______ teeth.
10.
1 point
Perhaps you've seen skeletal remains of __________________ towering above you in a museum.
11.
1 point
Most hard parts of organisms such as bones, _______, and shells have tiny spaces within them.
12.
1 point
___________ are fossils in which the spaces inside are filled with minerals from groundwater.
13.
1 point
It is from these original materials that _______, the chemical that contains an organism's genetic code, can sometimes be recovered.
14.
1 point
Sometimes ___________ replace the hard parts of fossil organisms.
15.
1 point
The tissues of most organisms are made of compounds that contain ___________.
16.
1 point
Sometimes fossils contain only __________.
17.
1 point
Fossils usually form when ____________ bury a dead organism.
18.
1 point
As sediment piles up, the organism's remains are subjected to ______________ and heat.
19.
1 point
A thin film of carbon residue is left, forming a ____________ of the original organism called a carbon film.
20.
1 point
___________ have been found in rocks as old as 500 million years.
21.
1 point
In swampy regions, large volumes of __________ accumulate.
22.
1 point
Over millions of years, these deposits become completely carbonized, forming ________.
23.
1 point
In nature, ____________ form when seashells or other hard parts of organisms fall into a soft sediment such as mud.
24.
1 point
The hard part might decay or dissolve, leaving behind a cavity in the rock called a _________.
25.
1 point
Sometimes conditions allow original soft parts of organisms to be preserved for thousands or ___________ of years.
26.
1 point
The amber surrounds and protects the original material of the insect's _______ from destruction.
27.
1 point
Original remains also have been found in natural tar deposits at Earth's surface, such as the ______________ in California.
28.
1 point
______________ are fossilized tracks and other evidence of the activity of organisms.
29.
1 point
Other trace fossils include ________ and burrows made by worms and other animals.
30.
1 point
One thing you can learn by studying fossils is that species of organisms have __________ over time.
31.
1 point
Some species of organisms inhabited Earth for long periods of time without ____________.
32.
1 point
__________ are the remains of species that existed on Earth for relatively short periods of time, were abundant, and were widespread geographically.
33.
1 point
The ___________ age is the time interval where fossil ranges overlap.
34.
1 point
Scientists can use _______ to determine what the environment of an area was like long ago.
35.
1 point
___________ also are used to determine the past climate of a region.
36.
1 point
According to the ___________________, in undisturbed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.
37.
1 point
Sediment accumulates in horizontal beds, forming layers of ___________ rock.
38.
1 point
The ______ layer to form is on the bottom.
39.
1 point
The ________ of something is its age in comparison to other things.
40.
1 point
The relative age of the rocks is older than the relative age of the _______.
41.
1 point
These gaps in rock sequences are called ____________.
42.
1 point
Unconformities develop when agents of _____ such as running water or glaciers remove rock layers by washing or scraping them away.
43.
1 point
__________ layers of sedimentary rock often are tilted and uplifted.
44.
1 point
Geologists call such an unconformity an _____________.
45.
1 point
Even though all the layers are ____________, the rock record still has a gap.
46.
1 point
This type of unconformity is called a ____________.
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