4.use of images from space
It gets polluted from fertilizers or any spilled chemicals. And those chemicals get obsorbed into the ground. And the gravity pushes them deeper in the soil, till it reaches the underground water (or aquifer)
Inge Lehmann's discovery of a solid outer core in Earth's layers. Hope I helped! Please mark as Brainiest!
3. Heart (The heart pumps oxygen thro our entire body, continuously)
4. Blood Vessels (In humans, nutrients are carried thro blood vessels)
I hope that helps!
The correct statement concerning pH is that the pH of a solution increases gradually with increasing basicity.