Riddles Keep the Brain Active

     Keeping one's brain active is one way to help keep us from getting old and senile. Thinking riddles through to conclusions can, thus, be useful. 

     Reader's Digest Magazine, over a period of time, has printed the following ones in a question-and answer format. They haven't listed originator names, so I can't give individual credits where due. 

     As you read the questions don't overthink. Keep common logic in mind;

Question 1: I am the beginning of the end of time and space. I am essential to creation, and I surround every place. Who am I?

Q2: Yellow I look, and massive I weigh; 

       In the morning I come to brighten mom's day. What am I?

Q3: A word I know contains six letters. Subtract the last letter and only twelve remain. What is the word?

Q4: What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Q5: A red house is made of red bricks and has a red wooden door and a red roof. A yellow house is made of yellow bricks and has a yellow wooden door and a yellow roof. What is a green house made of?

Q6: I multiply, but never breed; live on air, but never breathe; devour much, but never eat. I'm often measured by my heat. What am I?

ANSWERS:

1. The letter "e".

2. A school bus.

3. Dozens.

4. A river.

5. Glass.

6. Fire.