1. A rotating cloud of gas and dust from which Earth’s solar system may have formed is called a?

1.A rotating cloud of gas and dust from which Earth’s solar system may have formed is called a
A.solar nebula.
B.supernova.
C.solar eclipse.
D.nova explosion.

2.A small body from which a planet originated in the early stages of development of the solar system is called a
A.planetarium.
B.solar planet.
C.planetesimal.
D.protoplanet.

3.When the solar system formed, smaller bodies joined together through collision and the force of gravity to form larger bodies called
A.planetariums
B.solar planets
C.planetesimals
D.protoplanets

4.The difference between inner planets and outer planets in a solar system is that
A.the inner planets are considerably larger than the outer planets.
B.the inner planets are gaseous and the outer planets are more dense.
C.the inner planets have solid surfaces and the outer planets are more gaseous.
D.the inner planets have a greater elliptical movement around the sun than the outer planets.

5.Young Earth formed a core, mantle, and crust in a process called
A.layering.
B.settling.
C.dispersion.
D.differentiation.

6.According to nebular hypothesis, the features of newly formed planets depend on the distance between the protoplanet and the
A.moon.
B.orbiting stars.
C.developing sun.
D.rings of Saturn.

7.The early atmosphere developed when many volcanic eruptions released large amounts of gases in a process called
A.lava flow.
B.outgassing.
C.combustion.
D.ozone.

8.About 99% of all matter that was contained in the solar nebula now composes the
A.sun.
B.moons.
C.planets.
D.protoplanets.

9.Around the core of Earth is an iron and magnesium-rich rock layer called the
A.atmosphere.
B.mantle.
C.crust.
D.magma.

10.Some scientists think that a portion of Earth’s water may have come from space by way of
A.meteorites.
B.ice dust.
C.comets.
D.hydrogen clouds

11.Early fresh water oceans became salty when
A.rainwater carried dissolved solid rock to the oceans.
B.coral reefs created a salty ocean bottom.
C.salt particles fell from the atmosphere into the oceans.
D.floods carried salty soil to the deltas and then into the oceans.

12.The Earth’s solar system is composed of the sun and
A.inner planets, outer planets, and moons.
B.inner planets, gas giants, dwarf planets, and moons.
C.protoplanets, planets, and moons.
D.nebula, planets, and moons.

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