Question

movement of rivers and oceans
the constant flow of water transforms the surrounding environment.
crystallization
during the cooling process of magma, crystallization begins as a consequence of the decrease in temperature.
meteors
often small objects collide the earth. asteroids 5 to 10 meters
different geological processes act at different rates, ranging from extremely fast acting on fractions of seconds to minutes to days. to very slow acting over millions to billions of years.
click on the card that represents a slowest process.

Explanation:

Step1: Analyze the time - scale of each process

The movement of rivers and oceans is a continuous but relatively fast - changing process on a geological time - scale. Meteors collide with the Earth in a short time span. Crystallization during the cooling of magma occurs over long periods as the magma cools down. Magma cooling and crystallization can take thousands to millions of years.

Answer:

Crystallization