1. What is joint? Name the types of joints
2. What is compound machine?
3. What is Hydroelectricity?
4. Define soluble impurities with exampl
5. Identify the pictures of astronauts and
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1.A joint is a point where two or more bones meet. There are three main types of joints; Fibrous (immovable), Cartilaginous (partially moveable)8 and the Synovial (freely moveable) joint.
2.A compound machine is a machine that consists of more than one simple machine. Compound machines such as a wheelbarrow or corkscrew consist of just two simple machines. Big compound machines such as cars consist of hundreds or thousands of simple machines.
3.Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increase by about 3.1% each year for the next 25 years.
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