Final answer:
Landforms are physical features on the Earth's surface that form the terrain of an area. Landforms are the result of internal and external processes and can affect, modify, and influence climate. Mountains, plateaus, and plains are considered major landforms, and landforms can also exist under oceans.
Step-by-step explanation:
Landforms are physical features that shape the Earth's surface. They are the result of internal and external processes such as erosion, weathering, and tectonic forces.
Landforms can indeed affect, modify, and influence climate. For example, mountains can create a barrier that causes rain shadows, resulting in different climatic conditions on opposite sides of the mountain range.
Mountains, plateaus, and plains are actually considered major landforms, not minor. They are large-scale features that are significant in shaping the Earth's surface.
It is incorrect to say that landforms cannot exist under oceans. Underwater landforms like mountain ranges and basins do exist and are formed by tectonic activity.