A volcanic ash layer between sedimentary rock layers is used by geologists to 1. Determine the absolute age of the Earth

2. Predict global warming

3. Locate an earthquake epicenter

4. Correlate widely separated sedimentary rock layers

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

City a and city b had two different temperatures on a particular day. on that day, four times the temperature of city a was 8â° c more than 3 times the temperature of city b. the temperature of city a minus twice the temperature of city b was â’3â° c. what was the temperature of city a and city b on that day? city a was 5â° c, and city b was 4â° c. city a was 3â° c, and city b was â’1â° c. city a was 8â° c, and city b was â’3â° c. city a was 5â° c, and city b was â’5â° c.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.