Here's a breakdown of the most abundant elements by weight in the Earth's crust, water, and atmosphere:

Earth's Crust:

1. Oxygen (O): 46.6%

2. Silicon (Si): 27.7%

3. Aluminum (Al): 8.1%

4. Iron (Fe): 5.0%

5. Calcium (Ca): 3.6%

Water:

1. Oxygen (O): 88.8%

2. Hydrogen (H): 11.2%

*Note: While the Earth's oceans contain a small percentage of dissolved salts, they are negligible in terms of overall weight compared to the water itself.*

Atmosphere:

1. Nitrogen (N): 78.084%

2. Oxygen (O): 20.946%

3. Argon (Ar): 0.934%

4. Carbon Dioxide (CO2): 0.041%

5. Neon (Ne): 0.001818%

Important Notes:

* Relative Abundance: The proportions of elements can vary significantly depending on the specific location within the Earth's crust, atmosphere, and even within different parts of the ocean.

* Trace Elements: While these lists highlight the most abundant elements, there are many other elements present in smaller quantities, often referred to as "trace elements."

Let me know if you'd like more detail on any of these elements!