What is relative dating

Radiocarbon dating measures radioactive isotopes in once-living organic material instead of rock, using the decay of carbon-14 to nitrogen-14.Because of the fairly fast decay rate of carbon-14, it can only be used on material up to about 60,000 years old.Americans eat 50% more protein and fat than Japanese, who get more of their calories from fruit and vegetables. Hello Biffo, The five pronouns listed here are the ones found in most lists of relative pronouns, but you're right in thinking that 'where', 'when' and 'why' can introduce relative clauses.Many thanks Hello libero, The relative clause here (starting with 'who' and continuing to the end of the sentence) is a non-defining relative clause, which means that it provides extra information but does not define the noun which it describes. Best wishes, Peter The Learn English Team Hi, I'm slightly confused by the start of the article that states "The relative pronouns are: (who, whom, whose, which & that)" I'm planning a Primary School lesson on relative pronouns and, as I understand the National Curriculum, where and when can also be RPs, as in "I turned the TV off when the programme had finished" or "I looked at the mark on the floor where my daughter had scribbled her name". You might want to take a look at another grammar reference, for example the Cambridge Dictionary's, to compare how they are presented there.When Is the usage of "who" and "whom" correct in these sentences."She's the one who played the piano at the event." And "George, who is a funny man, died yesterday." This is Clara, whom I went to school with." "They are the ones who won the championship." Hello Timmosky, Yes, all of them are correct, though please note that 'whom' is quite uncommon in speaking nowadays. We use relative pronouns: • after a noun, to make it clear which person or thing we are talking about: the house that Jack built the woman who discovered radium an eight-year-old boy who attempted to rob a sweet shop • to tell us more about a person or thing: My mother, as the object of a verb or preposition: This is George, whom you met at our house last year.

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All the best, Kirk The Learn English Team Hello, (Bob is speaking) ''... Hello Jaml Makav, It's great that you noticed this.These break down over time in a process scientists call radioactive decay.Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.Best wishes, Peter The Learn English Team Hi, Why ‘who’ is used instead of ‘that’ in the following sentence?Can I omit the comma before their relative pronoun ‘who’?

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