what do scientists use to divide the geologic time scale?

major divisions in the fossil records
major divisions in the sedimentary rock layers
evidence for catastrophic events in earth's history
major changes in mineral deposits in the rock layers

Topographic maps are used to measure a-composition b-movement c-elevation d-texture

Northeastern china, north korea, northern japan containing coniferous forests, temperate grasslands, and agriculture, are all part of what climate zone? a. tropical desertb. desertc. humid subtropicald. humid continental

Why have the countries of the region had difficulty establishing democratic governments in recent years? choose all answers that are correct b is also correct i need to know if theres any morecommunists have overtaken the countries of the caucasus region. the soviets established national borders in the region without considering the location of ethnic groups. fighting continues between armenia and azerbaijan over the nagorno-karabakh region. civil war between communists and islamic groups in tajikistan resulted in thousands of deaths and refugees are forced to flee. in a test!