Why the fossil record has gaps, and what fossils say about past environments
Grade 9 Science Worksheet - Building Confidence
Circle the best answer.
Read this first
Drawing
a shell on a sea floor being covered by mud.
What two things most raise the odds that remains become a fossil, by Ari's reading (NPS)?
- Lying on the surface for years
- Warm air and bright sunlight
- Slow burial and soft parts
- Rapid burial and hard parts
Why does rapid burial help a fossil form, by Bo's reading (NPS)?
- Remains fossilize just as well when they are left lying on open ground
- Burial adds shells to the remains
- Sediment shields the remains from decay, weathering and scavengers
- Burial turns soft parts to stone at once
How likely is any one living thing to become a fossil, by Kira's reading (NPS)?
- About as likely as a coin landing heads
- Certain, if it lived long enough
- Very likely; most living things become fossils
- Very unlikely; the odds are very small
A footprint in rock is which kind of fossil, by Jun's reading (NPS)?
- A body fossil, since a foot made it
- A preserved remain of the foot
- A trace fossil
- A piece of amber
A shell pressed into mud leaves a hollow, three-dimensional print. What is that print called, by Luz's reading (NPS)?
- A mold
- A cast
- A steinkern
- A trace fossil, since no body is there
Sediment later fills that hollow print and hardens into the shell's shape. What is the filling called, by Milo's reading (NPS)?
- A burrow, which is a trace fossil
- An amber fossil
- A mold
- A cast
Most fossils are found in which kind of rock, by Pia's reading (NPS)?
- Sedimentary rock
- Metamorphic rock baked deep underground
- Igneous rock cooled from deep magma
- Rock from deep in the mantle
Why does the fossil record have gaps, by Tala's reading (NPS)?
- Gaps mean no life existed at those times
- Gaps mark times when the oceans dried up
- Scientists have already found each fossil there is
- Few remains are buried fast enough to become fossils
Which living things leave fossils more often, by Zee's reading (NPS)?
- Jellyfish with no hard parts
- Flying insects
- Animals of high mountains
- Sea animals with shells
the middle one has no Q fossils. In one model layer, no fossils of animal Q appear, though layers above and below have them. What is the most careful reading, by Esme's reading?
- Q did not exist at that time
- The middle layer must be younger than both
- Q vanished and later came back
- Q may have lived then but left no fossils here