Holt Earth Science Chapter 27 Test part 1

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

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

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

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

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

He proposed that planets rotated in epicycles around the Earth.

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

Which planets make up the Outer Planets?

Newton proposed this concept to explain Kepler's laws.

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

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

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

Which four planets make up the Inner Planets?

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

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

This astronomer proposed the heliocentric model

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

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

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

What two planets are also known as Ice Giants?

Copernicus proposed which model of the solar system?

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

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

This astronomer proposed an Earth-centered model.

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

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

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

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

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