Absolute dating measures unstable atoms of a sample, which occur because of Radioactive decay
Half-life
Relative Dating
Erosion

The Precambrian Era was dominated by life forms, the Paleozoic Era, , Mesozoic, , and Cenozoic is dominated by . *

Dinosaurs, Mammals, Aquatic, Single-Celled
Single-Celled, Aquatic, Mammals, Dinosaurs
Mammals, Dinosaurs, Aquatic, Single-Celled
Single-Celled, Aquatic, Dinosaurs, Mammals

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

Why would the crystals in an intrusive igneous rock be larger than the crystals in a chemical sedimentary rock? a. intrusive rocks form beneath the earth's surface, so they cool very slowly, which produces larger crystals. b. chemical sedimentary rocks form from dissolved substances on the earth's surface with very high heat and cool very slowly, which produces smaller crystals. c. chemical sedimentary rocks and intrusive rocks have crystals of the same size. o d. chemical sedimentary rocks form deep in the earth, so they cool slower, which produces small crystals. € read question correct:

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor. b. increased mechanization has increased the need for water, thereby increasing the need for labor. increased mechanization has increased the use of land, thereby increasing the need for labor. d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.