There are three major types of rock: igneous, sedimentary, and metamorphic.The rock cycle is an important concept in geology which illustrates the relationships between these three types of rock, and magma.The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.
The recrystallization that takes place does so essentially in the , rather than by complete remelting, and can be aided by ductile deformation and the presence of interstitial fluids such as water.Long before writing was developed, people recorded events, ideas, plans, and feelings by marking them on a rock. Some of their messages, produced thousands of years ago, can still be seen today. All of these markings are referred to as "Rock Art." People worldwide have been producing rock art for thousands of years.Time factors of millions and billions of years is difficult even for adults to comprehend.However, "relative" dating or time can be an easy concept for students to learn.