# Earth Science: Earth Materials and Processes, Book F

## Chapter 2: Rocks

### Calculate Thickness

 1. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.2 m thick. A) 0.1 m B) 0.08 m C) 0.06 m D) 0.04 m 2. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.15 m thick. A) 0.55 m B) 0.45 m C) 0.6 m D) 0.40 m 3. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.25 m thick. A) 0.75 m B) 0.25 m C) 0.5 m D) 1.5 m 4. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.4 m thick. A) 2.2 m B) 1.0 m C) 1.6 m D) 1.2 m 5. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.5 m thick. A) 1.9 m B) 1.5 m C) 2.1 m D) 2.5 m 6. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.6 m thick. A) 2.0 m B) 1.2 m C) 1.8 m D) 2.4 m 7. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.12 m thick. A) 0.56 m B) 0.30 m C) 0.42 m D) 0.36 m 8. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.18 m thick. A) 0.54 m B) 0.42 m C) 0.48 m D) 0.56 m 9. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.22 m thick. A) 0.60 m B) 0.66 m C) 0.42 m D) 0.35 m 10. It took 300 million years for a layer of plant matter about 0.9 m thick to produce a bed of bituminous coal 0.3 m thick. Estimate the thickness of plant matter that produced a bed of coal 0.9 m thick. A) 4.5 m B) 2.2 m C) 2.7 m D) 3.2 m