Question

cp earth science unit 1
multiple choice
identify the choice that best completes the statement or answers the question.

1. the process in which one type of rock changes into another type of rock because of chemical processes or changes in temperature and pressure is called

a. eruption.
b. melting and cooling.
c. sedimentation.
d. metamorphism.

1. what forces hold together the atoms in molecules?

a. magnetic fields
b. chemical bonds
c. chemical mixtures
d. gravity fields

1. earth scientists help us understand our world by explaining

a. how to cure diseases.
b. why countries go to war.
c. how to prevent natural disasters.
d. earth’s history and our place in the universe.

1. which of the following branches of earth science is related to the study of the universe beyond earth?

a. meteorology
b. geology
c. oceanography
d. astronomy

1. sedimentary rock that is made up of rock fragments that become compacted or cemented together is

a. organic.
b. chemical.
c. clastic.
d. inorganic.

1. sediment that has grains of approximately the same size is said to be

a. moderately sorted.
b. very poorly sorted.
c. poorly sorted.
d. well sorted.

1. the two most common elements in earth’s crust are

a. carbon and oxygen.
b. silicon and oxygen.
c. nitrogen and oxygen.
d. nitrogen and carbon.

1. in stratified layers of sedimentary rock, what structure forms when finer sediments settle on the bottom and large grains settle on top?

a. graded beds
b. cross - beds
c. massive beds
d. reverse grading

1. three factors that determine whether rock melts are

a. crystallization, heat, and pressure.
b. the presence of fluid, crystallization, and heat.
c. pressure, the presence of fluid, and crystallization.
d. heat, pressure, and the presence of fluid.

Explanation:

1. Metamorphism is the process of rock - type change due to chemical processes or temperature and pressure changes.
2. Chemical bonds hold atoms together in molecules.
3. Earth scientists help understand Earth's history and our place in the universe.
4. Astronomy is related to the study of the universe beyond Earth.
5. Clastic sedimentary rock is made up of rock fragments compacted or cemented together.
6. Sediment with grains of approximately the same size is well - sorted.
7. Silicon and oxygen are the two most common elements in Earth's crust.
8. Graded beds form when finer sediments settle on the bottom and large grains settle on top in stratified layers of sedimentary rock.
9. Heat, pressure, and the presence of fluid determine whether rock melts.

Answer:

1. d. metamorphism
2. b. chemical bonds
3. d. Earth’s history and our place in the universe
4. d. astronomy
5. c. clastic
6. d. well sorted
7. b. silicon and oxygen
8. a. graded beds
9. d. heat, pressure, and the presence of fluid