Red Rock Science: Mars Rover Geology Quiz

If scientists want to know if Mars was ever habitable, then they must examine the environment's past; if the history of a planet is recorded in its layers, then studying rocks and soil is the best way to find clues about ancient water.

If a robot needs electricity to move and use its cameras, and if there are no power outlets on Mars, then it must generate its own energy from the Sun or through radioactive heat to keep working.

If the Martian surface is covered in iron-rich minerals, and if those minerals react with tiny amounts of oxygen or water over millions of years, then they turn into iron oxide; if iron oxide is reddish-orange, then that explains the planet's color.

If a rover sees a rock it cannot reach, then it can fire a laser at it; if the laser vaporizes a tiny bit of the rock into a glowing spark, then the rover's camera can analyze that light to identify the chemical elements inside.

If new layers of mud and sand pile up on top of old ones, then the bottom layers are the oldest; if a rover climbs a mountain and studies each layer, then it is reading the timeline of Mars' climate history.

If rovers find minerals like clay and salts that only form in liquid water, and if these are found all over the planet, then Mars must have had a much thicker atmosphere and a warmer climate in its ancient past.

If a rover needs to see the tiny grains of sand or the texture of a rock, then a normal camera is not enough; if it uses a high-powered lens on the end of its arm, then it can capture details smaller than a human hair.

If the Martian soil contains high amounts of the mineral magnetite, and if rovers carry magnets that attract this dust, then the experiments have proven the magnetic nature of the surface material.

If astronomers need to track time on another planet with a different rotation speed, then they use a different name for the day; if Mars spins slightly slower than Earth, then one full rotation is defined as a "sol."

If the outside of a rock is covered in rusty dust from the Martian atmosphere, then the rover cannot see the original minerals; if it uses a drill or abrader to clear a small patch, then it can see the clean rock underneath.

If water flows in a river, it carries pebbles and sand that eventually settle and harden; if a rover finds layered rocks or rounded pebbles, then it proves that liquid water was once moving across that area.

If hematite is a mineral that usually forms in the presence of water, and if the rover found millions of tiny round hematite spheres, then this finding provides strong evidence that the area was once soaked in water.

If we are listing mobile robots that landed on the Martian surface to study rocks, then Spirit, Opportunity, Curiosity, and Perseverance are the correct names; Voyager 1 is a spacecraft that flew past the outer planets.

If a river flows into a lake, it leaves behind a fan-shaped pile of mud and rocks; if scientists want to find signs of ancient life, then this "delta" is the best place to look because it collects organic material.

If life requires building blocks like CHONPS (Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur), and if rovers have detected these in Martian rocks, then the planet had the right "ingredients" for life.

If a rover has cameras mounted on a tall pole to see the landscape from a human-like height, and if that pole is called a mast, then the cameras are naturally named Mastcams.

If rovers are looking for "biosignatures" (signs of past life), and if they have found organic molecules and water evidence, then they have found clues; however, as of today, they have not found any actual living organisms.

If conglomerate rocks are made of large, rounded pebbles cemented together, and if pebbles only become rounded by tumbling in water, then finding them proves there was once a fast-moving stream at that spot.

If Mars is a desert with sharp volcanic rocks and soft sand dunes, then rovers must navigate carefully to avoid damaging their aluminum wheels or sinking into a trap that they cannot drive out of.

If scientists look for places where water might have pooled in the past, then craters are a primary target; if the 2012 mission was sent to a specific 96-mile wide crater with a mountain in the middle, then that site is Gale Crater.