Science 704 Self Test 2

b. shine by reflected light

A correct statement is: Planets ____________________________________ a. are luminous b. shine by reflected light c. receive no light energy d. are the same size

Pluto

A dwarf planet is __________________________

Saturn

A planet that is characterized by rings of ice particles is ____________________________.

wanderers or planetae

Ancients called the planets ________________________________

away from

As the comet approaches the Sun, its tail points _____________________ the Sun.

a. one natural satellite

Earth has _______________________________________ a. one natural satellite b. five natural satellites c. twelve satellites d. no satellites

Photosynthesis is necessary for plants to produce food. This food is necessary to animal and human life (either by eating the plants or by eating the animals that eat the plants). Photosynthesis depends on light energy. We could not live without heat energy to warm the Earth, create climate, and so forth.

Explain this statement: All life on Earth depends on energy from the Sun.

A six-step reaction in which four hydrogen nuclei fuse to form one helium nucleus. The carbon atom is involved as a catalyst. Vast energy is released in the carbon cycle.

Explain this statement: The source of the Sun's energy is the carbon cycle.

counterclockwise

In general, planets revolve around the Sun in a ______________________ direction.

eight

Our solar system consists of _________________________ planets.

b. gravitational pull of the Sun

Planets are held in position by _____________________________________________ a. centrifugal force b. gravitational pull of the Sun c. centripetal force d. neither a, b, or c

150,000,000

The Earth and Sun are approximately __________________________________ kilometers apart.

sun

The center of the solar system is the _______________

terrestrial or inner

The four planets closest to the Sun are called the __________________________ planets.

a. frozen gasses and dust

The head of a comet is composed of ___________________________________ a. frozen gasses and dust b. ice and large rock c. rock alone d. neither a, b, or c

Jupiter

The largest planet in the solar system is ______________________________

b. greater than the number of planets

The number of moons in our solar system is ___________________________ a. equal to the number of planets b. greater than the number of planets c. less than the number of planets

c. Mercury

The planet closest to the Sun is __________________________________ a. Venus b. Mars c. Mercury d. Neptune

Venus

The planet known as the morning star or the evening star is ________________________.

elliptical

The planets move around the sun in ______________________ orbits.

c. Mars

The red planet is _______________________________ a. Jupiter b. Venus c. Mars d. Saturn

rotation

The spinning motion of a planet on its axis is called ______________________________

day

The time required by a planet to make one complete turn on its axis represents a __________________ on that planet.

c. Mercury and Venus

The two planets that orbit between the Sun and Earth are _________________________________________ a. Mercury and Mars b. Venus and Uranus c. Mercury and Venus d. Pluto and Neptune

Jovian

Those planets which lie beyond the asteroids are called the ________________________________ planets.

They are on the sun side of the earth.

Use the diagram to answer the next two questions: Why are Mercury and Venus never seen at midnight?

They are on the daytime side of the earth.

Use the diagram to answer the question When Mars is close to Earth, we see it large and bright. Why cannot Mercury and Venus be seen when they are closest to Earth?