Why do the four outer planets have lower density than the four inner planets?

Ascientific blank must be testable and capable of being proven false?

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew