Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Track | City | State | Opened (closing date if defunct) | Surface | Length |
| --- | --- | --- | --- | --- | --- |
| Altamont Motorsports Park | Tracy | California | 1966-2008 | Asphalt | miles (km) |
| Evergreen Speedway | Monroe | Washington | 1954 | Asphalt | miles (km) |
| Holland Speedway | Holland | New York | 1960 | Concrete | miles (km) |
| Indianapolis Speedrome | Indianapolis | Indiana | 1945 | Asphalt | miles (km) |
| Little Valley Speedway | Little Valley | New York | 1932-2011(figure 8 track) | Clay | miles (km) |
| Manzanita Speedway | Phoenix | Arizona | 1951-2010 | Asphalt | miles (km) |
| Riverhead Raceway | Riverhead | New York | 1951 | Asphalt | miles (km) |
| Slinger Speedway | Slinger | Wisconsin | 1974 | Asphalt | miles (km) |
Question:
What is the surface for the riverhead raceway?
Answer:
Asphalt