Science Quiz - Geologic Time Scale

list all of the eras from oldest to most recent.

precambrian, paleozoic, mesozoic, cenozoic

what is the geologic time scale

a record of the geologic events and life forms in Earth’s history

what are the divisions in the GTS based on?

major changes in life forms

what are eras divided into?

periods

what era was the age of mammals

cenozoic

what era was the age of invertabrates

paleozoic

what era was the age of reptiles

mesozoic

what are some biologic events that happened in the cenozoic era?

first grass appears, large mammals appear, ancestors of humans evolve, some mammals in Eurasia and north america go extinct after the ice ages

what are some geologic events that happened in the cenozoic era?

continents move to their present day spots, glaciers move to Antarctica and other continents, himalayas and rocky mountains form, ice ages

what are some geologic events that happened in the mesozoic era?

hot and dry climate, pangea breaks apart, widespread volcanic activity

what are some biologic events that happened in the mesozoic era?

first small mammals, dinos, reptiles, birds, flowering plants appear, mass extinction occurs

what are some geologic events that happened in the paleozoic era?

a lot of the world was submerged in warm and shallow water,

north america and europe became tropical and warm,

appalachian mountains formed,

pangea was created.

what are some biologic events that happened in the paleozoic era?

explosion leads to early vertabrae.

as land plants appear, vertabrae domination leads to age of fish/amphibians and they reach land.

large swamps and forests appear

what are some geologic events that happened in the precambrian era?

earth forms 4.6 billion years ago. ocean forms and covers earth and first sedimentary rocks form 4 billion years ago

what are some biologic events that happened in the precambrian era?

bacteria appeared, soft bodied multicellular organisms develop late in the time period, first mass extinction occurs near the end of the time.