Malika wants to build a toy raft that will float in water. She has a few materials to choose from. She takes a sample of each of these materials and measures their mass and volume. She records her measurements in a chart as shown. Which of these materials can Malika use to build her raft?

glass, cork, and lucite
pumice, rubber, and cedar
rubber, glass, and lucite
pumice, cedar, and cork

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.