A global network of observation stations measures the round trip time of flight of ultrashort pulses of light to satellites equipped with retroreflectors.
powerful source of data for studies of the solid Earth and its ocean and atmospheric systems
The answer to your question is: D. rainfall and ocean waves.
Looking at both figures shows that rain and the waves have changed the terrain.
Organized nationalist army and led insurgency, Guided Turkey from "Ottomanism" to "Turkishness"; separation of church and state; replaced Muslim calendar with Gregorian; purified/modernized Turkish language
hope this helps :)
