Atmospheres
This is the only terrestrial planet that does not have an atmosphere.
What is Mercury?
These types of Volcanoes are abundant on Mars, Venus, and Earth.
What are shield volcanoes?
Over half of this planet's surface is covered in water.
What is Earth?
Part of the definition of a planet now says that it has a "nearly ______ shape."
What is round?
Earth's moon has highlands, but it also contains these areas of solidified lava flows.
What are Maria?
This element is the largest component, by % composition, in Earth's atmosphere.
What is Nitrogen?
This is the only terrestrial planet that exhibits plate tectonics.
What is Earth?
Many people confuse the frozen "stuff" at Mar's North Pole with water; it is really this compound.
What is Carbon Dioxide?
This physical property of an object causes it to have gravity.
What is mass?
Mars has two moons, which are named this.
What are Phobos and Deimos?
This gas is a major contributor to the Greenhouse Effect.
What is Carbon Dioxide?
This is the name of the layer that is underneath the crust of a planet. Its hotspots can create volcanoes.
What is mantle?
The oceans of Venus most likely boiled away from this specific process.
What is the RUNAWAY Greenhouse Effect?
Out of the terrestrial planets, this planet has the SMALLEST radius.
What is Mercury?
Mercury and Venus show phases from Earth's perspective because it has this type of orbit.
What is inferior?
Compared to Earth, Venus and Mars have very little of this gas in their atmospheres. The gas also adds to the Greenhouse Effect.
What is Water Vapor?
These surface features, which show tributaries flowing into larger bodies of water, help give evidence to the fact that water has flowed on Mars.
What are deltas?
The majority of Mar's water is now locked away here, frozen.
What is the permafrost?
Out of the terrestrial planets, this planet has the LEAST density.
What is Mars?
In 2004, these two rovers landed on Mars.
What are Spirit and Opportunity?
The first planet from the Sun doesn't have an "atmosphere," but it does collect some of these elements/compounds from the Sun.
What are Hydrogen and Helium?
This surface feature is unique to Mercury, which has cooled off significantly since the formation of the planets.
What are scarps?
It appears that water marks around some craters on Mars indicate water is present. This is the special name given to those craters.
What are splosh craters?
Mercuy has the largest core to planet-size ratio. The core is 40% of total volume, and about this percentage of the planet's total mass!
What is 60%?
Gases can leave a planet's gravitational pull if it has this.
What is escape velocity?