The size of the Earth has not significantly changed over millions of years. While there are various geological processes that continuously shape the Earth's surface, such as erosion and tectonic activity, these processes do not cause significant changes in the overall size of the planet. The Earth's diameter has remained relatively constant over geological timescales.
Scientific evidence, such as measurements of the Earth's circumference and diameter, supports the conclusion that the size of the Earth has remained stable. Geodetic surveys, satellite measurements, and other techniques have consistently shown that the Earth's diameter is about 12,742 kilometers (7,918 miles) and its circumference is approximately 40,075 kilometers (24,901 miles).
However, it's worth noting that the Earth's surface is not entirely static due to various factors. For example, tectonic plate movements can cause the Earth's crust to deform and create new landforms over long periods of time. Erosion and sedimentation processes can also reshape the Earth's surface. But these processes occur on a relatively small scale and do not significantly alter the overall size of the planet.
In summary, while the Earth's surface undergoes continuous changes, the size of the planet itself has remained relatively constant over millions of years, as supported by scientific evidence.