What kind of deposits diatoms form in oceans?

Explanation

**Step-by-Step Solution:**

1. **Understanding Diatoms**: Diatoms are a type of algae that have unique cell walls made of silica. These cell walls are composed of two halves known as the epitheca (the larger upper half) and the hypotheca (the smaller lower half). Together, these two halves form a structure called the frustule.

2. **Siliceous Deposits**: When diatoms die, their silica-based cell walls remain in the ocean. Over time, these accumulated cell walls form deposits known as diatomaceous earth. This process involves the gradual accumulation of the silica from countless diatom remains.

3. **Formation of Diatomaceous Earth**: The formation of diatomaceous earth takes billions of years. The silica deposited in the cell walls of diatoms crystallizes into unique patterns that are specific to different species of diatoms.

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