Science Worksheets and Study Guides Seventh Grade

Acids, bases and salts
An acid is a compound that is defined by its physical and chemical properties. Acids taste sour and react with metals and polyatomic ions called carbonates. A carbonate is a charged cluster of Carbon and Oxygen atoms. In addition, when tested with blue litmus paper, acids turn the paper red. A base or hydroxide, like an acid, is also defined by its properties. Bases taste bitter, are slippery to the touch and turn red litmus paper blue. An example of a base is NaOH or sodium hydroxide. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 1
Agents of Erosion and Deposition
FreeForces of weathering and erosion are constantly reshaping Earth's surface. Erosion includes the chemical and physical breakdown of rocks and their transport from their point of origin to another location. Blowing wind, running water, flowing ice and and gravity are the forces that erode rock and sculpt the landscape. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 4
Bacteria and Viruses
Bacteria are prokaryotes, meaning that their DNA is in the cytoplasm because they do not have a nucleus. In addition to not having a nucleus, bacteria also do not have many of the other structures that are found in a eukaryotic cell. However, they still meet the criteria for being a living organism. There are three different shapes of bacteria: spiral, rod, and spherical shaped. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 4
Cell Processes
Nucleic acids are organic molecules that contain the instructions for all of the cell functions. They are made from carbon, hydrogen, oxygen, nitrogen, and phosphorus. There are two types of nucleic acids. DNA (Deoxyribonucleic acid), the genetic material of an organism, and RNA (ribonucleic acid), the important material in producing proteins within the cell. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 7
Cell Reproduction
FreeThe process where one cell forms two identical daughter cells is called cell division. There are three stages of the cell cycle: interphase, mitosis, and cytokinesis. DNA stands for DeoxyriboNucleic Acid. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 8
Chemistry in our world
Chemistry literally affects us twenty four hours a day. At any one moment in our bodies, thousands of chemical reactions are occurring. All of these reactions are controlled by catalyst-like chemicals called enzymes. Most of the chemical digestion of food we eat gets done in our small intestines with enzymes. Outside our bodies, chemicals and their reactions help us in many practical ways. Composites are mixtures of two or more substances, many of which are polymers with different properties, combine to give us better products. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 2
One key factor affecting climate is latitude. Because the Earth is a globe, the sun’s rays hit the equator more directly than they do near the poles. A second factor is that the Earth is tilted at 23.5 degrees on its axis as it rotates around the sun. As it does, the Northern and Southern hemispheres are either pointing toward or away from the sun’s rays. Consequently, lands near the equator have smaller temperature fluctuations throughout the year. The climate is predictably warm and humid. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 6
The theory of plate tectonics describes the movement of the plates of the lithosphere relative to each other. This movement creates forces that push and pull on the crust. Crustal rock can absorb and store energy, but only so much. There is a point at which the stress is more than the rock can hold and the rock breaks. When the rock breaks, the stored energy is released and this energy travels through the Earth. This sudden release of energy created when rocks break is called an earthquake Read more...iWorksheets: 5Study Guides: 1Vocabulary: 7
Ecosystems, food chains and food webs
Understanding food chains and food webs requires understanding the flow of energy and food sources among living things on Earth. A food chain represents a series of organisms connected by where they obtain their energy. A food web is made up of many different food chains in an ecosystem. A food web helps us understand how organisms are interrelated within an ecosystem. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 5
Elements and the periodic table
Elements are the purest form of matter and can not be broken down into any other substance by either a physical or chemical change. There are about 114 elements and they are organized on a modern Periodic Table of the Elements. The Elements are organized by their atomic numbers from top to bottom and left to right. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 2
Energy and energy resources
Mechanical energy is the energy of a moving object such as an airplane in flight. Thermal energy or heat energy: When a sidewalk warms up from the sun it now has thermal energy. Electrical energy speaks for itself. Whenever electricity is used, its energy is being used. Chemical energy is the energy that gets released when chemical bonds are broken. Electromagnetic energy is energy that travels in waves. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 2
Energy: Forms and Changes
Energy can have many forms, including mechanical, thermal, electrical, chemical, nuclear and electromagnetic energy. Mechanical energy = potential energy + kinetic energy. Thermal energy is the energy of an objects created by the motion (kinetic energy) of its particles (molecules and atoms). Chemical energy is the potential energy that is stored in chemical bonds. Electrical energy is produced by the movement of charged particles called electrons. Read more...iWorksheets: 3Vocabulary: 3
Exploring the Oceans/Oceanography
FreeThe oceans are highly comples environments. The oceans consist of different zones and habitats. As one moves deeper, the amount of light decreases, water temperature decreases and water pressure increases. There changing factors determine the zones and habitats and which organisms can live in each. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 5
Force is a pull or a push and its strength is measured in units called newtons and represented by the symbol F. Forces can act in combination and produce what is referred to as net force. Gravity is a type of force that pulls objects towards each other and toward the earth. Newton’s first law is that an object that is at rest will remain at rest and that an object in motion will continue in motion. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 1
Introduction to Plants
All plants are eukaryotes, with numerous cells, and they are all autotrophs, use photosynthesis to make food. Plants require sunlight to make food. : Plants have adapted to living on land by having the ability to obtain water and other nutrients from the soil. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 5
Mixtures, solutions and compounds
Mixtures, unlike compounds, are the physical combination of different substances. Solutions are a type of mixture with at least one solute and solvent. In a solution, finely dissolved particles of a solute are dissolved by the solvent. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
When motion occurs, there is speed and velocity. Speed is calculated by dividing the distance traveled by the time it took to travel. Velocity has an additional component. Velocity tells you how fast an object is going and where it is going. Therefore, if two objects have the same speed, but are going in different directions, they will have different velocities. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 1
Our Solar System
Solar systems begin in the dust and gas clouds found in between the stars. The dust is composed of elements like iron and carbon. The gas is hydrogen and helium. These dusty clouds are called nebulae. Here these particles start to come together to form planets. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 3
Photosynthesis and Respiration
What is Photosynthesis? Photosynthesis is the process that green plants use to capture energy from the Sun and convert it to food. Plants produce oxygen and food in the form of sugar during the process of Photosynthesis. It occurs in two stages. The first stage occurs when light is captured by the chlorophyll pigments in the leaves and converted to energy in the chloroplast. Read more...iWorksheets: 3Vocabulary: 3
Protists and Fungi
What is a protist? The protist is the most diverse Kingdom of classified organisms on Earth. Protists are combined into the same Kingdom because they are all eukaryotes and they live in a liquid environment. There are protists that are unicellular and multicellular. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 6
Sound is the energy objects produce when they vibrate. Sound energy is a form of mechanical energy. The substance that the sound waves travel through is called the medium. A medium can be a solid, liquid or gas. In a longitudinal wave, the particles of the medium move back and forth, while the energy moves forward. Then the particles are pushed together, it is called compression. When the particles are spread apart, it is called rarefaction. Read more...iWorksheets: 3Vocabulary: 4
Technology in our world
Engineers use technology to meet human demands and to provide solutions to our problems. Of all the types of consumer goods, clearly electronics seems to have benefited most from technological development. One example of this is in the area of wireless technology. Cell phones using networks of microwave generating cell towers have dramatically changed the way we communicate. Read more...iWorksheets: 3Study Guides: 1Vocabulary: 1
The Sun-Earth-Moon System
The Earth is simultaneously spinning on its axis(rotation) and revolving around the sun. As viewed from space, the Earth rotates counter-clockwise. This is called prograde rotation. Planets that spin clockwise are said to have retrograde rotation. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 5
The World of Life Science
Scientific inquiry is a process of designing and conducting scientific investigations including asking a question, completing an investigation, attempting to answer the question, and presenting the results to other. A conclusion is summing up the information from an investigation by either supporting the hypothesis or not. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 2
The intense heat and pressures in the mantle turn solid rock into liquid magma. Magma comes out through the surface of the crust to form volcanoes. Three volcanoes categories are cinder cones, shield volcanoes and stratovolcanoes. The ash and rock that is extruded by explosive volcanoes is called pyroclastic material. This volcanic mudflow is called a lahar. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 4
Weathering of rocks and soil formation
Weathering is a collection of natural processes that, over time, break large rock into smaller and smaller pieces. Rocks can be broken down by physical processes (called mechanical weathering) and chemical processes (called chemical weathering). Soil is a combination of decomposed rock and organic materials. Read more...iWorksheets: 4Study Guides: 1Vocabulary: 4
Work and machines
Work is the exertion of force through a distance. The formula for its calculation is: work =force x distance. For an example, if 5 newtons of force were applied for 5 meters, the amount of work done would be 25Nm. Mechanical advantage = output force/input force. For example, if a machine takes the force coming in and multiplies it three times, the mechanical advantage would be 3. Read more...iWorksheets: 4Study Guides: 1

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