Do you need homework help for 8th grade science? If so, you need to read this article. So, take 5 minutes now, to get yourself back on track for a good grade in science! Most junior high school science classes broadly cover the natural science, from basic physics, chemistry, earth sciences, and biology. Grasping so many concepts can be tricky Get a 8th grade online science tutor, free worksheets and homework help from eTutorWorld with Certified online tutors. Sign up for your Free Trial now! +Estimated Reading Time: 3 mins 8th Grade Science Worksheets and Study Guides. The big ideas in Eighth Grade Science include exploring the life, earth, and physical sciences within the framework of the following topics: “Earth’s Biological History” (Earth’s biological diversity over time); “Earth’s Structure and Processes” (materials and processes that alter the structure of Earth); “Astronomy: Earth and Space Systems”
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Membership Benefits Benefits Sign Up Sign In. English Language Arts. Social Studies. select by Standards. Science Worksheets and Study Guides Eighth Grade Earth Science: Astronomy Our Solar System The Sun is by far the most massive object in the Solar System, therefore gravitationally dominating all other members of the Solar System.
The Sun is a star that gives off radiant energy that drives Earth systems and is essential for life. The Solar System consists of comets, asteroids, planets, and their respective satellites, most of which orbit the Sun on a plane called the ecliptic.
The planets in our Solar System revolve in the same direction around the Sun in elliptical orbits that are very close to being in the same plane, 8th grade science homework help. Read more i Worksheets: 3. Stars, Galaxies and the Universe Stars do not just exist randomly throughout the universe, 8th grade science homework help. They are clustered in large groups. Large groups of stars in space are called galaxies.
Our galaxy is called The Milky Way. Astronomers estimate that there are from billion to billion stars in the Milky Way. i Worksheets: 3 Study Guides: 1 Vocabulary: 3. The Movement of Ocean Water The crest of a wave is the highest point of the wave.
The lowest point of a wave is the trough. The distance between two adjacent crests is the wavelength. The wave height or wave amplitude is the distance from the crest to the trough. The wave frequency is the number of waves that pass a given point each second. i Worksheets: 3 Study Guides: 1 Vocabulary: 2. Earthquakes An earthquake is the result of a release of stored energy in the Earth's crust that creates seismic waves.
Seismographs are machines that detect and measure seismic waves caused by earthquakes, 8th grade science homework help. P waves, or primary seismic waves, are the fastest moving waves. They travel through solids, 8th grade science homework help, liquids and gases.
S waves or secondary waves are slower and can travel through solids, but not liquids. The slowest and most destructive seismic waves are called surface waves. i Worksheets: 3 8th grade science homework help 4. Fossils Ancient life forms have been preserved, in part and in whole, in the rock record. These preserved pieces of ancient life forms are called fossils. Fossils found in limestone are usually formed by a process called cast and mold.
Petrified wood is formed by a process called petrification. In very hot, arid environments, flesh can be dried out and preserved indefinitely. This process is called mummification. i Worksheets: 4 Study Guides: 1 Vocabulary: 2. Geologic time 8th grade science homework help of the Earth is 4, 8th grade science homework help. Geologic time scale is a map that divides Earth history into logical segments of time.
The geologic time scale is broken into divisions and subdivisions. The divisions are called eons. Eons are divided into eras, eras are divided into periods, and periods are divided into epochs. i Worksheets: 4 Study Guides: 1. Minerals A mineral, by definition, 8th grade science homework help, must meet four criteria. It must: be a naturally occurring substance, be a solid substance, have an internal crystal structure and have been formed by inorganic processes in other words, it cannot be formed by an organism.
A rock, by comparison, is composed of one or more minerals or organic material such as coal. i Worksheets: 4 Study Guides: 1 Vocabulary: 3.
Plate tectonics The Earth is a dynamic planet. Its interior is actually in motion! The crust on its surface is also in motion. It was not until the 20th century that geologists truly began to understand Earth's dynamic movements. New theories, supported by ever-improving technologies, have made it possible to more clearly understand the forces working within the planet we call home. i Worksheets: 4 Study Guides: 1 Vocabulary: 7. Igneous: Formed when crystallized through melting and cooling.
Sedimentary: Formed through the accumulation of sediment. Compaction - process by which overlying pressure from rocks and soil reduces the size or volume of sediments. Rock cycle - the continental process by which rocks can be changed into different types. i Worksheets: 3 Vocabulary: 3. Volcanoes Earth's crust is fractured into 13 major and approximately 20 total lithospheric plates.
Most of the Earth's volcanoes are located at lithospheric plate boundaries. Why does a volcano erupt? When magma rises towards the surface, gas bubbles expand and increase in pressure. The force of the gas pushes the magma out of the vent and causes an eruption. Understanding Weather The global winds in the Northern hemisphere curve to the right. The global winds in the Southern hemisphere curve to the left. This is due to the Coriolis 8th grade science homework help. Bones, muscles, and skin Free The human body works very smoothly carrying out 8th grade science homework help daily functions because it is organized.
The human body has different levels of organization that consist of cells the smallesttissues, organs, and organ systems the largest.
i Worksheets: 3 Study Guides: 1 Vocabulary: 7. Circulation and immunity The circulatory system, otherwise known as the cardiovascular system, consists of the heart, blood vessels, and blood. The heart has two separate sides, the right and left, 8th grade science homework help, which are separated by the septum.
The septum prevents oxygen-rich blood from mixing with oxygen-poor blood. The valve prevents blood from flowing backwards in the one-way direction of the circulatory system. There are three types of blood vessels in the human body: arteries, capillaries, and veins. Respiration and excretion Air travels through the nose, pharynx, trachea, and the bronchi within the lungs.
Oxygen is gained by the respiratory system and glucose is gained from the digestive system. Both the oxygen and glucose are transported around the body by the circulatory system.
With every breath, we pull oxygen out of the atmosphere. i Worksheets: 3 Study Guides: 1 Vocabulary: 4. They are carbohydrates, fats, proteins, minerals, vitamins, and water. There are three main functions of the digestive system. They are to break down foods into molecules that the body can use, absorb the molecules into the blood and send them all throughout the body, and eliminate wastes from the body.
i Worksheets: 3 Study Guides: 1 Vocabulary: 5. The Endocrine system and Reproduction The endocrine system controls long-term and short-term changes of the body and many of the daily activities of the body. The system is made up of glands, which are organs that produce and secrete chemicals.
Endocrine glands release chemicals called hormones into the bloodstream, which will then be carried throughout the body. The hypothalamus is a small part of the brain that links the nervous system and the endocrine system together.
The nervous system The nervous system gathers information from inside and outside of the body, responds to the information that it gathers and helps to maintain homeostasis. There are three different types of neurons: sensory neurons, interneurons, and motor neurons. The three different types of neurons will work together to carry messages all throughout the nervous system.
i Worksheets: 3 Study Guides: 1 Vocabulary: 6. The Evolution and interaction of Living Things Over 3. All of these gases are still on Earth today, but in different quantities. The gases in Earth's atmosphere include: Nitrogen - 78 percent, Oxygen - 21 percent, Argon - 0. Modern Genetics The main function of a gene is to regulate the production of proteins within 8th grade science homework help. Proteins establish the phenotype, physical characteristics, and many other traits of a particular organism.
Recall from Topic 5 that DNA is made up of 4 different nitrogen bases, Adenine AThymine TGuanine Gand Cytosine C.
i Worksheets: 4 Study Guides: 1 Vocabulary: 6. Heat and heat technology All matter is made up of particles that vibrate with kinetic energy.
This movement of particles occurs even when the temperature goes well below zero.
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, time: 12:06Printable Eighth Grade Science Worksheets and Study Guides.
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