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1. Phases of water

Earth - Solid, Liquid and Gas

Mars - Solid and Gas

2. Distance

Earth = 1 AU

Mars > 1 AU

3. Appearance of surface

Earth - Oceans, forests, rocks

Mars - Craters, Rocky

4. Moons

Earth -1

Mars -2

Explanation:

Question 1

Water is in found as solid, liquid and gas  in the earth. The solid form ice is found in glaciers, arctic and the Antarctic. The liquid form of water is in oceans, lakes and rivers. The gaseous form water vapor is found in air.

Water is found in solid and gas phase in Mars. Mars has ice in the surface and  vapor in the atmosphere. Mars does not have water in liquid form since it has a very low pressure and temperature.

Question 2

One Astronomical unit is  the distance from  sun to earth. Hence distance to earth from sun = 1 AU

Mars is farther from the sun compared to the earth. Hence the distance to Mars from Sun is greater than 1 AU.

Question 3

The major part of earth is covered by water and renaming part is covered with forests, soil, rocks, desert etc.

The surface of Mars is full of craters, volcanoes and canyons.

Question 4

Earth has one moon. Mars has two moons.  

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).