What has one letter and starts with an E?

I am white when I am dirty, and black when I am clean. What am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What month of the year has 28 days?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

Which is the correct shadow of the bird?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What is the Surname of Barbie Doll?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?