Clues From the Past

What was Rodolfo Coria's initial impression when he first saw the leg of an Argentinosaurus?

• He felt like a giant looking at a small bone.

• He felt like a mouse looking up at a giant leg of
• He felt like a paleontologist who had found a new species.

• He felt like he had discovered the largest dinosaur ever.

What are fossils?

• Fossils are rocks formed from volcanic activity.
• Fossils are imprints or parts of animals, plants, and other organisms that have been preserved in rock. .

• Fossils are modern animal bones found in museums.
• Fossils are the living things.

Sediment is made up of sand, ​ ​ (a)   , tiny bits of rock. ​

What type of rock are fossils usually found in?

• Igneous rock

• Metamorphic rock

• Sedimentary rock

• Volcanic rock

What is the correct sequence of events in the formation of sedimentary rock?

• Sediment compacts, then sinks through water, then cements.

• Sediment sinks through water, then compacts, then cements.

• Sediment cements, then sinks through water, then compacts.

• Sediment compacts, then cements, then sinks through water.

Which of the following can form fossils, in addition to animal bodies?

• Only animal shells.

• Only plants.

• Plants, molds of shells, and fossilized trees.

• Only fossilized trees.

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What was one of the initial inferences Rodolfo Coria made about Argentinosaurus based on its fossil bones?

• It was a small, fast-moving dinosaur.

• It had wings and could fly.

• It was big and walked on four legs.

• It was an aquatic dinosaur.

How did scientists infer that Argentinosaurus ate plants?

• They found fossilized plant remains in its stomach.

• They observed its teeth had flat ends, similar to modern plant-eating animals.

• They found it near ancient plant fossils.

• They compared its bone structure to known carnivorous dinosaurs.

What was a key characteristic inferred about Argentinosaurus's movement?

• It was a very fast runner.

• It could fly short distances.

• It walked slowly.

• It was an agile climber.