Final answer:
The difference between Earth's highest mountain and its deepest ocean trench is 65,233 feet. The difference between Mars' highest mountain and its deepest canyon is 96,000 feet. Hence, Mars has a greater difference of 30,767 feet.
Step-by-step explanation:
To understand the difference in elevations between the deepest canyons on Mars and Venus, and the differences between the highest and lowest elevations on Earth and Mars, we'll perform some straightforward subtraction using the data provided.
First, the difference between Earth's highest mountain, which is Everest at 29,035 feet, and its deepest ocean trench, which is the Mariana Trench at -36,198 feet, is:
29,035 ft - (-36,198 ft) = 65,233 ft.
Next, on Mars, the highest mountain is Olympus Mons at 70,000 feet, and the deepest canyon is Valles Marineris at -26,000 feet, which yields a difference of:
70,000 ft - (-26,000 ft) = 96,000 ft.
Comparing these two differences, the difference on Mars (96,000 ft) is greater than that on Earth (65,233 ft).
By subtracting the Earth's difference from Mars's, we find how much greater the difference on Mars is:
96,000 ft - 65,233 ft = 30,767 ft.
Therefore, the difference between Mars's highest mountain and its deepest canyon is 30,767 feet greater than the difference between Earth's highest mountain and its deepest ocean canyon.