Final answer:
Coasts formed by lava flows and hardening into rock are typically classified as emergent coasts. These coasts arise from the land rising or sea level falling, revealing former sea floors and creating new land that is often rugged and steep.option 1 is correct
Step-by-step explanation:
Coasts formed by lava flows hardening into rock are classified as volcanic coasts. However, this is not one of the options provided. Given the context, the closest classification from the provided options would likely be an emergent coast.
Emergent coasts are formed by the relative rise of land or fall in sea level that exposes former sea floors. On such coasts, features like marine terraces, uplifted beach deposits, and wave-cut platforms are common. In contrast, submergent coasts are characterized by rising sea levels that flood existing land features.
Erosional coasts, as the name suggests, are heavily influenced by processes of erosion, such as wave action and coastal currents, shaping the landscape. Depositional coasts are built up from the accumulation of sediment deposited by rivers, waves, and currents. option 1 is correct