pub fn micrometeorite_overturn_rate_mm_myr(flux_index: f64) -> f64 {
    1.2 + 3.0 * flux_index.max(0.0)
}

pub fn space_weathering_index(exposure_myr: f64, solar_wind_factor: f64) -> f64 {
    (1.0 - (-exposure_myr / 80.0).exp()) * solar_wind_factor.max(0.0)
}

pub fn thermal_fatigue_rate_mm_yr(temp_swing_k: f64) -> f64 {
    temp_swing_k.max(0.0) * 0.0002
}
