geological timescale and humans

traces or imprints of living things that died a long time ago and are preserved by geological processes in rock

• fossils

• relative datin

• absolute dating

• geological timescale

• mass extinction

When more than 50% of species over a period of time die, it is called ________________

• extinction

• relative datin

• absolute dating

• geological timescale

• mass extinction

if the last member of the species dies it is called

• extinction

• relative datin

• absolute dating

• geological timescale

• mass extinction

It is the calendar scientists use to outline the history of life on Earth, It is organized in chronological order with all the fossils of past life on earth.

• extinction

• relative datin

• absolute dating

• geological timescale

• mass extinction

Analyzing the age of remains of organic matter through the decaying of carbon atoms.

• extinction

• relative datin

• absolute dating

• geological timescale

• mass extinction

•The atmosphere was made of gases such as water, carbon dioxide and nitrogen.

• precambrian times

• paleozic era

• cenozoic era

• mesozoic era

•Eukaryotes, which are more complex than prokaryotes, evolved about 1 billion years ago

• precambrian times

• paleozic era

• cenozoic era

• mesozoic era

•Sponges, corals, snails, clams, squids and trilobites appeared in this era

• precambrian times

• paleozic era

• cenozoic era

• mesozoic era

•By the end of this era, forests of giant ferns, club mosses, horse tails and conifers covered much of the earth.

• precambrian times

• paleozic era

• cenozoic era

• mesozoic era

•It began 251 million years ago and ended about 65million years ago.

• precambrian times

• paleozic era

• cenozoic era

• mesozoic era