Year 4 Work for 26th January

Good morning Year 4
We hope you are well.
The answer to yesterday's quiz question was Chamonix in France. For today's question can you tell me the answer to this riddle? Going forwards I'm very heavy, going backwards I'm not.
I have uploaded the English, Maths and Science tasks for the blog. If you have any questions, feel free to email us.
Best wishes
The Year 4 Team
English, Maths and Science tasks for Tuesday 26/1/21