Front

What are index fossils?

Back

Index fossils are fossils of organisms that were widespread but only existed for a short period of geological time. They are used to date and correlate the age of rock layers.

Front

How are sedimentary rocks formed?

Back

Sedimentary rocks are formed through the processes of compaction and cementation of sediments.

Front

What is the significance of the trilobite fossil?

Back

The trilobite is considered one of the oldest known fossils, providing important information about early life on Earth.

Front

What does it mean if a fossil is found in the top layer of a cliff wall?

Back

It indicates that the fossil is younger than those found in lower layers, as sedimentary layers are deposited over time.

Front

What is the role of genetic mutations in evolution?

Back

Genetic mutations can lead to changes in traits, which may affect an organism's survival and reproduction, contributing to evolution.

Front

What does compaction refer to in geology?

Back

Compaction is the process by which sediments are pressed together under pressure, reducing their volume.

Front

What is cementation in the context of sedimentary rock formation?

Back

Cementation is the process where dissolved minerals precipitate from water and fill the spaces between sediment grains, binding them together.

Front

Why might a population of moose become smaller over generations?

Back

A population may become smaller due to environmental factors such as limited food resources, which can affect growth and reproduction.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of a once-living organism, often found in sedimentary rock.

Front

What is the difference between a gastropod and a trilobite?

Back

Gastropods are a class of mollusks that include snails and slugs, while trilobites are an extinct group of marine arthropods.