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Unit 8

Across
Layers of sedimentary rock, representing various periods of deposition
Two or more forms of a chemical element that vary in the number of neutrons in the nucleus and by the atomic mass
The era lasting from 65 mya until the present, encompassing the radiation and proliferation of mammals such as humans and other primates
Rock formed when the deposition of sediments creates distinct layers, or strata
Marine protozoans that have variably shaped shells with small holes
The evolutionary relationships of a group of organisms
Refers to various structures on Earth's surface, such as the continental plates.
Rock formed from the crystallization of molten magma, which contains the radioisotope 40K; used in potassium-argon dating
Down
Type of dating methods that use predictable chemical changes that occur over time
The chemical reaction resulting in the conversion of L amino acids to D amino acids for amino acid dating
Major divisions of geologic time that are divided into periods and further subdivided into epochs
The second major era of geologic time, 230-65 mya, characterized by the emergence and extinction of dinosaurs
The study of the deposition of plant or animal remains and the environmental conditions affecting their preservation
Divisions of periods (which are the major divisions of eras) in geologic time
A hypothetical landmass in which all the continents were joined, approximately 300-200 mya