what is the largest layer of earth's surface , composed mostly of silicon,oxygen,magnesium,and iron

http://jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry8.html

it has 6 lettes

Yep. Check that site to find your answer.

is it mantle

Yes, it's mantle.

The largest layer of Earth's surface, which is also the outermost layer, is called the crust. It is composed mostly of silicon, oxygen, magnesium, and iron, along with other elements. To find this information, you can refer to any reliable source of geology or earth science, such as textbooks, research papers, or educational websites.

Here's a step-by-step guide on how you can find this information using an online search engine:

1. Open your preferred web browser and go to a search engine like Google.
2. Type in the search bar: "composition of Earth's crust" or "what elements make up the Earth's crust."
3. Press Enter or click on the search button.
4. You will see a list of search results related to the topic. Look for reliable sources like scientific journals, educational websites, or articles from renowned geological institutions.
5. Click on a relevant link that seems trustworthy and reputable, such as a university or government website.
6. Navigate through the webpage or article to find the information about the Earth's crust composition. The crust is typically described as being made up primarily of silicon, oxygen, magnesium, and iron, among other elements.
7. Take note of the specific information you find or copy it for future reference.

Remember to rely on trustworthy sources to ensure accurate and credible information.