Geology Flashcards
Invertebrate
Has no backbone
Paleozoic Rock
Contains fossils of the first plants and animals.
Earth Age
4.568 billion years
Cenozoic era
The age of animals
Relative Dating
How old is something relative to something else
Relative Dating fossils
Measured by how deeply buried they are when discovered
Precambrian era
Oxygen started by photosynthesis in cells
Geologic time
Based on fossil animals and plants
Uranium half life
4.5 billion years
Youngest fossils are _______ years old.
10,000
Human domain
Eukarya
Human kingdom
Animalistic
Human phylum
Chordata
Human class
Mamalia
Human order
Primates
Human family
Hominid ad
Human genus
Homo
The 3 types of radioactive particles
Alpha (largest)
Beta (smaller) can injure humans
Gamma (smallest) high energy can disrupt cells
Alpha particles consist of ________
2 neutrons and 2 protons
Beta particles consist of _________
Electrons
Gamma rays consist of ________
Entirely energy
Half-life definition
The time it takes for a radioactive substance ( the parent) to lose half its radioactivity (decays to the daughter material)