Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

Could you survive on an iceberg for several days if you had enough supplies?

 It would be possible to survive on an iceberg for several days if you had enough supplies and took appropriate precautions, but it would be a challenging and potentially dangerous situation. Here are a few things to consider:

Shelter: An iceberg is a large piece of ice floating in the ocean, so you would need some sort of shelter to protect yourself from the elements. This could be a tent, a makeshift structure, or even a hollowed-out area within the iceberg itself.

Warmth: An iceberg is a very cold environment, and you would need to find a way to keep warm in order to survive. This could include using blankets, sleeping bags, or other insulating materials, as well as using heat-generating equipment such as a stove or heater.

Food and water: You would need to have a supply of food and water in order to sustain yourself on an iceberg. This could include non-perishable items such as canned goods and bottled water, as well as any equipment needed to melt ice for drinking water.

Medical supplies: It would be important to have a basic supply of medical supplies on hand in case of injury or illness. This could include first aid supplies, medications, and any other items you might need in an emergency.

Communication: If you are stranded on an iceberg, it will be important to have a way to communicate your situation and your location to others. This could be a satellite phone, a radio, or other equipment that allows you to call for help.

Overall, surviving on an iceberg for several days would require careful planning and the ability to adapt to a very harsh and isolated environment. It would also be important to pay close attention to your surroundings and be prepared for any potential hazards or challenges that may arise.