What percentage of water is trapped in the oceans and seas? 

96.5%

The correct answer is option 2. 96.5%.

Water on Earth is distributed across various reservoirs, and the largest percentage is found in the oceans and seas. Here's an explanation of the distribution of water on Earth:

1. Oceans and Seas:

About 96.5% of the Earth's water is found in the oceans and seas. Oceans are vast bodies of saltwater that cover a significant portion of the Earth's surface. The principal oceans include the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, and Arctic Ocean.

2. Freshwater:

The remaining approximately 3.5% of the Earth's water is freshwater, which includes water in the form of ice, groundwater, and surface water. Freshwater is crucial for supporting terrestrial life and human activities.

a. Ice and Snow: A significant portion of freshwater is stored in the form of ice caps, glaciers, and snow, primarily in polar regions and mountainous areas.

b. Groundwater: Groundwater is water stored beneath the Earth's surface in aquifers. It represents a substantial portion of the freshwater available for human use.

c. Surface Water:  Surface water includes rivers, lakes, reservoirs, and wetlands. It is a critical source of freshwater for ecosystems and human consumption.

3. Accessible Freshwater:

Of the total freshwater, only a small percentage is readily accessible for human use. This accessible freshwater is vital for agriculture, industry, and domestic purposes.

Summary:

The vast majority of the Earth's water, approximately 96.5%, is saline water found in the oceans and seas. The remaining 3.5% is freshwater, with a significant portion stored as ice, groundwater, and surface water. Managing and preserving freshwater resources are essential for sustaining life on Earth and supporting various ecosystems and human activities.