Seeing the social function, both procedure and explanation texts have the similarity in which both describe how to make or done something. They give the detail description on something, phenomena, goods, product case or problem.
To see the differences between explanation and procedure, we have to analyze the dominant language feature and how the texts are used.
Procedure, this text type is commonly called as instruction text. It uses pattern of commend in building the structure. It use the “to infinitive verb” which is omitted the “to”. It is a kind of instruction text which uses full commend verb. Procedure is commonly used to describe how to make something which is close to our daily activity. For example how to make a cup of tea, how to make a good kite, etc is the best example of the procedure text. It is such word; first boil water, secondly prepare the cup, and so on.
Explanation, it is commonly used the passive voice in building the text. Explanation is such a scientific written material. It describes how certain phenomenon or event happen. How a tornado form, how tsunami works are the best example of explanation text. It uses passive pattern in describing the topic.

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The Legend of Toba Lake
Once upon time, there was a handsome man. His name was Batara Guru Sahala. He liked fishing. One day, he caught a fish. He was surprised to find out that the fish could talk. The fish begged him to set it free.
Batara Guru could not bear it. He made the fish free. As soon as it was free, the fish changed into a very beautiful woman. She attracted Batara Guru so much. He felt in love with that fish-woman. The woman wanted to marry with him and said that Batara Guru had to keep the secret which she had been a fish. Batara Guru aggreed and promised that he would never tell anybody about it.
They were married happily. They had two daughters. One day Batara Guru got very angry with his daughter. He could not control his mad. He shouted angrily and got the word of fish to his daugters. The daughters were crying. They found their mother and talked her about it.
The mother was very annoyed. Batara Guru broke his promise. The mother was shouting angrily. Then the earth began to shake. Volcanoes started to erupt. The earth formed a very big hole. People believed that the big hole became a lake. Then this lake is known as Toba lake.

Note on Narrative Generic Structure
ORIENTATION: The first paragraph presents information about the participant of the story. In literary term, the participant is called as character. Orientation commonly introduces information about WHO, WHERE and WHEN.
COMPLICATION: Paragraph two explores the niche of the story. That is conflict among the characters of the story. This conflict will involve physical and psychological conflict. The conflict is actually the heart of any narrative text. It will drive the participant to make effort in solving the crisis.
RESOLUTION: The last paragraph closes the story with solving the crisis. However it can be better or worse.