Describe the environmental advantages and disadvantages of using hydroelectric power to generate electricity in the UK. (6 marker)

Hydropower is generally available as needed; engineers can control the flow of water through the turbines to produce electricity on demand.

Explanation:

Impact on Fish. To create a hydro plant, a running water source must be dammed.

Limited Plant Locations. While hydropower is renewable, there are limited places in the world that are suitable for plant construction.

Higher initial Costs.

Carbon and Methane Emissions.

Susceptible to Droughts.

Flood Risk.

explanation:

Hydroelectric power is energy created using the power and movement of flowing or falling water. It currently makes up only around 2.2% of Britain's total electricity supply, but has a long history in the country, having first been harnessed in 1878 to power the lights of Cragside country house in Northumberland. Globally, hydropower accounts for around 17% of all energy production, so should the UK rethink its approach to going green.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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the answer is c) an oak tree