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The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.

The right heart consists of two chambers, the right atrium and the right ventricle, separated by a valve, the tricuspid valve.

The left heart has two chambers: the left atrium, and the left ventricle, separated by the mitral valve. The heart wall is made up of three layers: the inner endocardium, middle myocardium and outer epicardium.

These are surrounded by a double-membraned sac called the pericardium. The heart functions as a pump in the circulatory system to provide a continuous flow of blood throughout the body.

This circulation consists of the systemic circulation to and from the body and the pulmonary circulation to and from the lungs. Blood in the pulmonary circulation exchanges carbon dioxide for oxygen in the lungs through the process of respiration.

The systemic circulation then transports oxygen to the body and returns carbon dioxide and relatively deoxygenated blood to the heart for transfer to the lungs.

All rights reserved. Privacy Statement and Disclaimer Notice. Search for Resources. Anatomy of the Heart Coloring Page.

Heart Diagram Coloring Page. Water covers roughly 71 percent of Earth's surface, and most of that is in the oceans.

About a fifth of Earth's atmosphere consists of oxygen, produced by plants. While scientists have been studying our planet for centuries, much has been learned in recent decades by studying pictures of Earth from space.

While Earth orbits the sun, the planet is simultaneously spinning on an imaginary line called an axis that runs from the North Pole to the South Pole.

It takes Earth Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through the planet's orbit around the sun.

This means the Northern and Southern hemispheres will sometimes point toward or away from the sun depending on the time of year, and this changes the amount of light the hemispheres receive, resulting in the seasons.

Earth's orbit is not a perfect circle, but rather an oval-shaped ellipse, similar to the orbits of all the other planets. Our planet is a bit closer to the sun in early January and farther away in July, although this variation has a much smaller effect than the heating and cooling caused by the tilt of Earth's axis.

Earth happens to lie within the so-called "Goldilocks zone" around the sun, where temperatures are just right to maintain liquid water on our planet's surface.

Scientists think Earth was formed at roughly the same time as the sun and other planets some 4.

As the nebula collapsed because of its gravity, it spun faster and flattened into a disk. Most of the material was pulled toward the center to form the sun.

Other particles within the disk collided and stuck together to form ever-larger bodies, including Earth.

Scientists think Earth started off as a waterless mass of rock. But in recent years, new analyses of minerals trapped within ancient microscopic crystals suggests that there was liquid water already present on Earth during its first million years, Marchi said.

Radioactive materials in the rock and increasing pressure deep within the Earth generated enough heat to melt the planet's interior, causing some chemicals to rise to the surface and form water, while others became the gases of the atmosphere.

Recent evidence suggests that Earth's crust and oceans may have formed within about million years after the planet took shape.

Earth's core is about 4, miles 7, km wide, slightly larger than half the Earth's diameter and about the same size as Mars ' diameter.

The outermost 1, miles 2, km of the core are liquid, while the inner core is solid; it's about four-fifths as big as Earth's moon, at some 1, miles 2, km in diameter.

The core is responsible for the planet's magnetic field , which helps to deflect harmful charged particles shot from the sun.

Above the core is Earth's mantle , which is about 1, miles 2, km thick. The mantle is not completely stiff but can flow slowly.

Earth's crust floats on the mantle much as a piece of wood floats on water. The slow motion of rock in the mantle shuffles continents around and causes earthquakes, volcanoes and the formation of mountain ranges.

Above the mantle, Earth has two kinds of crust. The dry land of the continents consists mostly of granite and other light silicate minerals, while the ocean floors are made up mostly of a dark, dense volcanic rock called basalt.

Earth orbits the sun once every Since our calendar years have only days, we add an extra leap day every four years to account for the difference.

Though we can't feel it, Earth zooms through its orbit at an average velocity of During this circuit, our planet is an average of 93 million miles away from the sun, a distance that takes light about eight minutes to traverse.

Astronomers define this distance as one astronomical unit AU , a measure that serves as a handy cosmic yardstick.

Earth rotates on its axis every This axis of rotation is tilted Whichever hemisphere is tilted closer to the sun experiences summer, while the hemisphere tilted away gets winter.

In the spring and fall, each hemisphere receives similar amounts of light. On two specific dates each year—called the equinoxes—both hemispheres get illuminated equally.

About 4. Over time, Earth's interior—which is made mostly of silicate rocks and metals—differentiated into four layers. At the planet's heart lies the inner core, a solid sphere of iron and nickel that's miles wide and as hot as 9, degrees Fahrenheit.

The inner core is surrounded by the outer core, a 1,mile-thick band of iron and nickel fluids. Beyond the outer core lies the mantle, a 1,mile-thick layer of viscous molten rock on which Earth's outermost layer, the crust, rests.

On land, the continental crust is an average of 19 miles thick, but the oceanic crust that forms the seafloor is thinner—about three miles thick—and denser.

Like Venus and Mars, Earth has mountains, valleys, and volcanoes.

Planet Heart