1. The text states that scientists have discovered evidence of water on Mars in the past, including dried-up riverbeds and minerals that form in water. However, no liquid water has been found on the surface today. The current atmosphere is too thin and cold to support stable liquid water, which would either freeze or evaporate quickly. While there may be water ice at the poles or underground, no flowing or standing liquid water has been observed on the surface.
2. Evidence includes:
- Dried-up riverbeds and channels visible from orbit.
- Minerals like hematite and clay that only form in the presence of liquid water.
- Geological features such as deltas and sedimentary rock layers.
- Detection of hydrated minerals by rovers and orbiters.
- Observations of recurring slope lineae (dark streaks) that may indicate briny water seeping seasonally, though this is still debated.
3. Water is essential for life as we know it because:
- It acts as a solvent, allowing chemical reactions necessary for metabolism to occur.
- It helps transport nutrients and waste within organisms.
- It regulates temperature and maintains cellular structure.
- All known biological processes require water to function.
- Finding water increases the likelihood that life, even microbial, could have existed or might still exist on Mars.
Parent Tip: Review the logic above to help your child master the concept of finding text evidence worksheets pdf.
