Holt Earth Science Chapter 27 Test Review

How long ago do scientists estimate that the solar system formed?

Which planet's surface has what scientists call a "youthful appearance?"

An attractive force that exists between any two objects in the universe.

This planet's blue-green color results from the presence of methane in its atmosphere.

Scientists hypothesize that our oceans became salty over time because of what?

A region, just beyond the orbit of Neptune, that contains dwarf planets and other small bodies.

He was the first to suggest that everything revolved around the Earth.

Copernicus proposed which model of the solar system?

Of the inner planets, which have moons? (more than one answer)

The Earth's core is believed to be composed of what molten substances?

Planets are believed to have been formed from the collisions of smaller bodies called what?

Our freshwater oceans are believed to have been formed from? (more than one)

What process led to the formation of layers in our planet?

The relationship between the average distance of a planet from the sun and its orbital period.

The appearance of objects moving backward in space

Newton proposed this concept to explain Kepler's laws.

Earth's atmosphere was formed through what process involving volcanoes?

What traits are associated with the terrestrial planets? (more than one)

A "wrinkle in time" is believed to have caused the cliff-like appearance of this planet?

Which planet has sulfur dioxide droplets in its atmosphere that reflect the sun's rays?

Scientists theorize that these helped to absorb a lot of the Carbon Dioxide in our atmosphere?

This astronomer proposed the heliocentric model

What is the rotating cloud of dust and gas that formed the solar system called?

At first, Earth's atmosphere was full of this gas?

Which of Kepler's laws states that each planet orbits the sun in an ellipse?

How is Pluto different from the outer planets

Before modern scientific calculations even existed, he proposed the nebular hypothesis?

This astronomer proposed an Earth-centered model.

The atmospheres of the gas giants are comprised mostly of which gases?

Which planet's rapid rotation and low density cause it to suffer the battle of the bulge?

Which law states that areas through which an object sweeps in a given period are equal?

Which four planets make up the Inner Planets?

During the formation of our solar system, where did most of the matter go?

Which planets make up the Outer Planets?

Jupiter's most distinctive feature is what?

Nuclear fusion is believed to have occurred within the sun how long ago?

Which planet is known to have a Great Dark Spot?

Which gas giant(s) are known to have rings? (more than one answer)

Which planet is the largest in the solar system?

Kepler's law which describes how fast planets travel at different points in their orbits is?

This planet's existence was predicted before it was ever seen?

This collected high in the atmosphere to shield Earth from harmful ultraviolet radiation?

What two planets are also known as Ice Giants?

Which planet has seasons very similar to our own?

He proposed that planets rotated in epicycles around the Earth.

Surface features on Mars are indicative of what?

The next stage in planet formation that follows the planetesimal stage?

Which hypothesis states the sun and planets developed out of a cloud of dust and gas?

Which planet rotates super quick?

Which planet's axis of rotation is nearly parallel to the plane of its orbit?