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5th Grade Chapter 8 Fossils
Science 5th Grade, Chapter 8 Fossils
Terms in this set (21)
the preserved remains or traces of a living thing,
show what living things were like in the past and how they have changed through time
the study of fossils
compares fossils with similar organisms living today, they study ways living things have changed, they look for clues to a past organism's shape and size to try and learn what it ate and how it moved
Describe the ancestor elephant
the ancestors of the elephant had no trunk or tusks. changes in organisms often help them survive
How did the change in elephants help?
the trunk helps elephants today, to get water and grab food
When did the mastodons and mammoths live?
they lived during the Ice Ages so they had thick, shaggy hair that kept them warm
Elephants today live how?
they live in warmer places and are covered with thin, wiry hair
Are plants fossils and Why?
since plants have no parts as hard as shells or bones, they usually decay before becoming fossils.
when dead cells are replaces by minerals
Describe plant life
like animals, plant fossils show how living things have changed over time. The first plants, like first animals lived in the sea. Scientists theorize that plants began to live on land about 430 million years ago. Most fossils of these older plants look different than modern plants.
What was the main type of plant?
Ferns were the main type of plant for more than 175 million years.
Describe the difference and similarities in past and modern ferns
They were the first plants to have roots, stems and leaves, which the modern ferns also have. Past ferns did not have the flat fronds that modern ferns have.
Plants with seeds came when?
plants with seeds appeared later than ferns. The earliest seed plants had cones. those were followed by flowering plants 250 million years later
some fossils look like nothing that lives on Earth today
the theory that the continents have been slowly drifting apart for millions of years
about 225 million years ago, all of the Earth's landmasses were joined. It broke apart into pieces and then into smaller pieces, Earth's continents
How do fossils form?
when organisms die some remains are buried in sediment, ice or tree sap. Molds and casts preserved the shapes of organisms. Both begin when hard remains are buried in sediment. The sediment hardens into rock, and then hard remains dissolve.
the hollow space that is left
forms when dissolved minerals fill the space and harden
evidence of an animal's activities
help scientists find the age of a rock layer that may be out of order. They come from organisms that lived in many places around the world during a brief period of time. They provide a way to math rocks of the same age found in different places
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