Focus on Earth science

Readers will learn about 500,000 earthquakes happen every year around the world. Most earthquakes are too small for people to notice.

There are more than 1,500 active volcanoes around the world. Most of Earth's active volcanoes are found in a region called the Ring of Fire.

Readers will learn about 100,000 tons (91,000 metric tons) of rock fall to Earth from space every year. The world's lightest rock is pumice.

Readers will learn that rocks are found all over Earth. The rock cycle is a process that recycles rocks from one type to another.

Readers will learn that fossils are the rock like remains of ancient animals and plants. They are usually found in sedimentary rock.

Readers will learn minerals are the most common materials on Earth. Scientists have found more than 3,000 types of minerals on the planet.