Lesson Worksheet: Fossils Science

In this worksheet, we will practice describing cast, mold, trace and petrified fossils, and explaining what information can be gained from studying fossils.

Q1:

Dead organisms can form petrified fossils. Which of the following best describes a petrified fossil?

  • AA fossil that forms when organic material is replaced by minerals but the original shape does not change (e.g., dinosaur eggs)
  • BAn imprint left by the bones or shells of the organism on the rock that surrounds it
  • CA piece of evidence left by the organism when it was still alive
  • DA complete replica of the organism, formed from when the bones were filled in and surrounded by sediment

Q2:

Which of the following best describes what a fossil is?

  • AThe remains left by nonliving factors of a past ecosystem
  • BThe imprint left by an organism on the ground
  • CThe preserved parts of plants contained in amber or ice
  • DA collection of DNA left by an organism that has decomposed
  • EThe preserved remains of an organism that was once alive

Q3:

A shell can leave a mold fossil. Which of the following best describes a mold fossil?

Ammonites and their molds-squared
  • AA mold fossil is a complete replica of the shell, formed from when the shell was filled in and surrounded by sediment.
  • BA mold fossil forms when organic material is replaced by minerals, but the original shape does not change.
  • CA mold fossil is an imprint left by the shell on the rock that surrounds it.
  • DA mold fossil is a piece of evidence left by the organism when it was still alive.

Q4:

Which type of fossil (mold, cast, or trace) is shown in the picture?

Real dinosaur footprint
  • ATrace
  • BMold
  • CCast

Q5:

Which type of fossil (mold, cast, or trace) is shown in the picture?

Imprint fossil of an ammonite
  • AMold
  • BTrace
  • CCast

Q6:

Complete the following: A fossil that can tell us the age of the sedimentary rocks that surround it is called .

  • Aa time fossil
  • Ban index fossil
  • Ca reference fossil
  • Dan atypical fossil
  • Ea trace fossil

Q7:

A sample of rock is taken by a geologist. The sample contains foraminifera. What does this indicate?

  • AThat the sample has been contaminated by living organisms
  • BThat the sample of rock is only 2,0005,000years old
  • CThat this would be a good area for petroleum exploration
  • DThat this area would have most likely been part of a desert

Q8:

Complete the following: A fossil that has kept the shape and details of the whole organism is known as a .

  • Afull trace fossil
  • Bcast or mold fossil
  • Ccomplete body fossil
  • Dpetrified fossil
  • Emammoth fossil

Q9:

The picture shows a piece of amber. What type of fossil has been preserved in this amber?

piece of amber (fossilised tree resin) contains an insect-edited
  • ATrace fossil
  • BPetrified fossil
  • CMold fossil
  • DComplete body fossil
  • ECast fossil

Q10:

Trace fossils can be left by extinct organisms, like dinosaurs. Which of the following best describes a trace fossil?

  • AA trace fossil is an imprint left by the bones of the dinosaur on the rock that surrounds it.
  • BA trace fossil forms when organic material is replaced by minerals, but the original shape does not change.
  • CA trace fossil is a complete replica of the dinosaur, formed from when the bones were filled in and surrounded by sediment.
  • DA trace fossil is a piece of evidence left by an organism when it was still alive.

This lesson includes 4 additional questions for subscribers.

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