what does the below rebus means?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

What happened when the wheel was invented?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Count the number of triangles in the below picture?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?