Science Worksheets and Study Guides Eighth Grade

Bones, muscles, and skin
The human body works very smoothly carrying out its daily functions because it is organized. The human body has different levels of organization that consist of cells(the smallest), tissues, organs, and organ systems (the largest). Read more...iWorksheets: 3Study Guides: 1Vocabulary: 6
Chemical bonding
FreeChemical bonding involves only an atom's outermost electrons. These electrons are called valence electrons and because they have more energy than other electrons, they tend to be found further away from the nucleus. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
Chemical reactions
Worksheets: 4Study Guides: 1Vocabulary: 1
Circulation and immunity
Worksheets: 3Study Guides: 1Vocabulary: 7
Worksheets: 3Vocabulary: 3
Forces in fluids
In fluids, which are substances that can flow, pressure is the sum of each of the forces of each particle in the fluid. Examples of fluids include liquids such as water and gases such as air and helium. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
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. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 2
Geologic time
Worksheets: 4Study Guides: 1
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. When we use the term temperature, we are referring to the amount of thermal energy that a substance has. Thermal energy is the sum of the energy of the moving particle and the potential energy of the resting particles. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
Introduction to physical science
Worksheets: 3Study Guides: 1Vocabulary: 1
Worksheets: 4Study Guides: 1Vocabulary: 2
A mineral, by definition, 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). Read more...iWorksheets: 4Study Guides: 1Vocabulary: 3
Mirrors and lenses
The reflection of light can occur in different ways. Since a mirror has a very smooth surface, all the light bouncing off of a mirror reflects in a regular manner. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 2
Modern Genetics
Worksheets: 4Study Guides: 1Vocabulary: 5
Organic compounds
Organic chemistry is the study of carbon compounds. Because there are so many of these in living things, organic chemistry is sometimes thought of as living chemistry. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
Our Solar System
Worksheets: 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. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 7
Properties of atoms
Worksheets: 4Study Guides: 1Vocabulary: 1
Respiration and excretion
Worksheets: 3Study Guides: 1Vocabulary: 4
Worksheets: 3Vocabulary: 2
Worksheets: 4Study Guides: 1Vocabulary: 1
Stars, Galaxies and the Universe
Stars do not just exist randomly throughout the universe. They are clustered in large groups. Large groups of stars in space are called galaxies. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 2
The Digestive and nutrition
Worksheets: 3Study Guides: 1Vocabulary: 4
The endocrine system and Reproduction
Worksheets: 3Study Guides: 1Vocabulary: 5
The energy of waves
Worksheets: 3Study Guides: 1Vocabulary: 2
The Evolution and interaction of Living Things
Over 3.5 billion years ago, the Earth was much different than it is today. Scientists believe that early Earth’s atmosphere was made up of nitrogen, water vapor, carbon dioxide, and methane. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 2
The Movement of Ocean Water
Worksheets: 3Study Guides: 1Vocabulary: 1
The nervous system
Worksheets: 3Study Guides: 1Vocabulary: 5
Understanding Weather
Worksheets: 4Study Guides: 1Vocabulary: 3
Worksheets: 3Vocabulary: 3

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