What is conserved in physical changes?
shape
energy
mass
density

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective