1. Rocks with a high surface area:

* Fractured rocks: Cracks and fissures allow water and other weathering agents to penetrate deeper into the rock, increasing the surface area exposed to weathering.

* Porous rocks: Rocks with many interconnected pores (like sandstone or limestone) provide spaces for water to seep in and freeze (frost wedging), or for chemical reactions to occur.

2. Rocks that are chemically susceptible to weathering:

* Rocks with easily dissolved minerals: Limestone, marble, and gypsum are easily dissolved by acidic rainwater.

* Rocks with minerals that react readily with oxygen: Iron-rich rocks (like some igneous rocks) can oxidize (rust), weakening the rock.

3. Rocks that are physically weaker:

* Sedimentary rocks: These rocks are often made of smaller grains held together by weak cement. They are easily broken apart by physical weathering processes like abrasion.

* Metamorphic rocks: Some metamorphic rocks are weaker than their parent igneous or sedimentary rocks, due to changes in their mineral composition during the metamorphic process.

4. Rocks that are exposed to harsher environments:

* Rocks in climates with frequent freeze-thaw cycles: The expansion of water when it freezes puts stress on rocks, leading to breakage.

* Rocks exposed to high levels of acid rain: Acid rain can accelerate chemical weathering, particularly in rocks like limestone.

Examples of easily weathered rocks:

* Limestone: Easily dissolved by acid rain.

* Sandstone: Grains are loosely held together, making it susceptible to abrasion.

* Schist: Some types of schist are relatively weak and easily weathered.

Examples of rocks that are more resistant to weathering:

* Granite: A hard, igneous rock with high resistance to both physical and chemical weathering.

* Quartzite: A metamorphic rock with a very hard and resistant mineral composition.

* Basalt: A dark-colored igneous rock that is often resistant to weathering.

Remember that the specific type of weathering that occurs will depend on the type of rock, the climate, and other environmental factors.