Answer:
mountain and coastal plains
Explanation:
According to the question, a hiker crosses a topography near the sea which has low elevation and low relief and proceeds to climb steeply to reach a peak.
The two landforms the hiker experienced are mountain and coastal plain.
A coastal plain is a flat, low-elevation land which is close to the sea.
A mountain is an elevated land form that has a peak and is higher and more difficult to climb than a hill.
