Here's why:

* Newton's Law of Universal Gravitation: The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

* Earth's Mass and Distance: As you move closer to the Earth's center, the distance between you and the Earth's mass decreases. This decrease in distance leads to a stronger gravitational force and therefore a higher acceleration due to gravity.

* At the Surface: At the surface of the Earth, you are closest to the majority of Earth's mass, resulting in the strongest gravitational pull and maximum acceleration due to gravity.

Important Note:

* Above the Surface: As you go higher above the Earth's surface, the distance increases, and the acceleration due to gravity decreases.

* Inside the Earth: While the distance decreases, the amount of Earth's mass pulling on you also decreases as you go deeper into the Earth. This results in a decrease in acceleration due to gravity as you approach the Earth's core.